Heptagon diagonals

Calculate the maximum number of diagonals that can be drawn in an octagon using the suitable formula. Easy. View solution > Find the maximum number of diagonals that can be drawn in n-sides polygon. Also, find number of diagonals if i. n=12 sides ii. n=15 sides iii. decagon. Easy. View solution >

The sum of exterior angles of a heptagon is 360 degrees. For regular heptagon, the measure of the interior angle is about 128.57 degrees. The measure of the central angle of a regular heptagon is approximately 51.43 degrees. The number of diagonals in a heptagon is 14.A hexagon has six sides. There are 3 diagonals from a single vertex, and there are 6 vertices on a hexagon, which suggests there would be 18 diagonals in a hexagon. However, we must divide by two as half of the diagonals are common to the same vertices, Thus there are 9 unique in a hexagon. The formula for the number of diagonals of a …Decagons in which all the interior angles are less than $180^\circ $ is known as convex decagons. Or, a convex decagon is a decagon whose diagonals lie inside it. In the above figure, all the diagonals will lie inside the decagon. Concave Decagons. Concave decagons are the decagons in which at least one interior angle is greater. than $180^\circ $.Draw an arbitrary circle, centred at a point . Keep in mind that you will need some extra space around the circle for construction lines. [1] 2. Draw the radius . [2] 3. Draw a circle with radius , centred at . This circle intersects the first circle at points and .But since we've counted each one twice, it's really 54 divided by 2, or 27. Generalizing for an n-gon. If you look at our example for a 9 sided figure, you can see how we used the number 9 in our figuring, and we can just substitute n in its place to find the number of diagonals in an n-gon: d = 1 / 2n ( n -3) Nov 28, 2020 · All stars are concave polygons. Figure 1.18.1 1.18. 1. A convex polygon does not cave in. Convex polygons look like: Figure 1.18.2 1.18. 2. A diagonal is a non-side line segment that connects two vertices of a convex polygon. Figure 1.18.3 1.18. 3. The red line segments are all diagonals. This pentagon has 5 diagonals. 由於此網站的設置，我們無法提供該頁面的具體描述。In a regular heptagon, all angles are equal, each measuring approximately 128.57 degrees. The total sum of the interior angles of any heptagon is always 900 degrees, regardless of whether it is regular or irregular. Diagonals. A heptagon has 14 diagonals, which are line segments that connect two non-adjacent vertices. Regular vs. Irregular ...

In this case, a heptagon has seven sides, and thus (7 - 2) = 5 triangles can be drawn. ... By drawing all the diagonals from one vertex, the polygon is divided up into triangles. The sum of the interior angles of the polygon is equal to the sum of the internal angles in the triangles. With n vertices, each vertex is not directly connected to n ...(4). The latter can be easily proved by applying Ptolemy's theorem to the quadrilateral with sides c , a , a , and b , and diagonals c and b , and dividing ...In this case, yes, the diagonals passing through the center are equal in length. BUT that doesn't necessarily generalize to other regular polygons, because there may not be diagonals "passing through the center". No,they aren't.You may consider any regular polygon having greater than 5 sides for example.The examples below give you some basic approaches to try. 1. Break into triangles, then add. 2. Find 'missing' triangles, then subtract. 3. Consider other shapes. As you can see, there an infinite number of ways to break down the shape into pieces that are easier to manage. You then add or subtract the areas of the pieces.With all diagonals: there are $\frac62(6-3)=9$ diagonals of which there are 3 pairs of parallels, so of the $\binom{9}{3}=84$ ways of selecting three diagonals, we have to exclude $3\times (9-2)=21$ parallel pair of diagonals plus another, and also the $6$ way of selecting all three diagonals from a vertex and $1$ way of three diagonals through ...The radius of the circle inscribed in a regular heptagon calculator. r = a 2⋅tan(π 7) r = a 2 ⋅ tan ( π 7) Known data: Heptagon- information. Heptagon - a polygon with seven sides and seven interior angles. The sum of the angle measures in any heptagon is 900°. A regular heptagon is a regular polygon with seven equal sides and internal ...

An Interior Angle is an angle inside a shape. Example: ... Pentagon. A pentagon has 5 sides, and can be made from three triangles, so you know what ..... its interior angles add up to 3 × 180° = 540° And when it is regular (all angles the same), then each angle is 540° / 5 = 108° (Exercise: make sure each triangle here adds up to 180°, and check that the pentagon's …This is a step by step video of how to draw a heptagon by using a ruler and a compass.This is a seven-sided polygon.The formula obtained by subtracting n using nC2 methods is \ [\frac {n (n-3)} {2}\]. The total sides of a hexagon, for example, are six. As a result, the total diagonals are 6 (6-3)/2 = 9. Let’s know what a diagonal is. A diagonal of a polygon can be defined as a line segment joining two vertices. From any given vertex, there are no diagonals ...Aug 3, 2023 · Formula for Number of Diagonals of a Polygon. This equation is obtained by adding the number of diagonals that each vertex sends to another vertex and then subtracting the total number of sides from it. For example, in a pentagon the total number of sides is five. Hence, the number of diagonals in them are 5 (5-3)/2 = 5. Square, rectangle, rhombus, and trapezoid are examples of a convex quadrilateral. b) Concave Quadrilateral. It is a type of quadrilateral with at least one of its interior angles measuring greater than 180°. A concave quadrilateral has one of its diagonals outside the closed figure. Dart or arrowhead is an example of concave …The heptagon is sometimes referred to as the septagon, using "sept-" (an elision of septua-, a Latin -derived numerical prefix, rather than hepta-, a Greek -derived numerical prefix; both are cognate) together with the Greek suffix "-agon" meaning angle. In geometry, a heptagon or septagon is a seven-sided polygon or 7-gon.

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Calculate the maximum number of diagonals that can be drawn in an octagon using the suitable formula. Easy. View solution > Find the maximum number of diagonals that can be drawn in n-sides polygon. Also, find number of diagonals if i. n=12 sides ii. n=15 sides iii. decagon. Easy. View solution >By regularity of the heptagon, A1A2 =A2A3 = c A 1 A 2 = A 2 A 3 = c. Finally, the quadrilateral A1A2A3A5 A 1 A 2 A 3 A 5 is inscribed in the circle k k and therefore it satisfies Ptolemy's theorem, according to (one direction of) which. which is exactly the relation c(a + b) = ab c ( a + b) = a b.Jun 2, 2020 · In this video you will learn about the mathematical properties of a regular heptagon. A regular heptagon is a 7 sided shape with equal edges. It also has an ... Decagons in which all the interior angles are less than $180^\circ $ is known as convex decagons. Or, a convex decagon is a decagon whose diagonals lie inside it. In the above figure, all the diagonals will lie inside the decagon. Concave Decagons. Concave decagons are the decagons in which at least one interior angle is greater. than $180^\circ $.Perimeter. perimeter = n × a. Read more about polygon perimeter in the perimeter of a polygon calculator. Angles : α = (n - 2) × π / n, where α is an interior angle; β = 2 × π / n, where β is an exterior angle. If you're particularly interested in angles, you may want to take a look at our polygon angle calculator.A regular heptagon has diagonals of two different lengths. Let a a be the length of a side, b b the length of a shorter diagonal, and c c the length of a longer diagonal. Prove that. a2 b2 + b2 c2 + c2 a2 = 6 and b2 a2 + a2 c2 + c2 b2 = 5. a 2 b 2 + b 2 c 2 + c 2 a 2 = 6 and b 2 a 2 + a 2 c 2 + c 2 b 2 = 5. What I have so far:

Menggambar Diagonal. Unduh PDF. 1. Ketahui nama-nama poligon. Anda terlebih dahulu perlu menentukan banyaknya sisi pada poligon. Setiap poligon memiliki nama sesuai dengan jumlah sisi yang dimilikinya. Berikut adalah nama-nama poligon sampai 20 sisi: Segi empat/tetragon: 4 sisi. Segi lima/Pentagon: 5 sisi.Nov 28, 2020 · All stars are concave polygons. Figure 1.18.1 1.18. 1. A convex polygon does not cave in. Convex polygons look like: Figure 1.18.2 1.18. 2. A diagonal is a non-side line segment that connects two vertices of a convex polygon. Figure 1.18.3 1.18. 3. The red line segments are all diagonals. This pentagon has 5 diagonals. Regular heptagon has all seven sides of equal length. Each interior angle of a regular heptagon measures 128.571 . Irregular heptagons have different side lengths …Vertices of a Heptagon. A heptagon is a special type of polygon that is classified by the number of sides it has. We can determine how many vertices that a heptagon has by observing its general shape and counting the number of vertices it contains. Answer and Explanation:FIGURE 1 shows, the triangle has no diagonals, the square and pentagon each have one kind of diagonal, and the hexagon and heptagon have two. Some diagonal lengths can be discovered by using the Pythagorean theorem or a cosine or sine of a special angle, but to obtain closed forms for 4 in the pentagon and for p and o- in the heptagon we need more.The diagonals are not perpendicular to each other; here diagonals AC & BD are not perpendicular The adjacent central angles at the point of intersection are not equal, but the opposite central angles are equal; here ∠AOB = ∠COD & ∠BOC = ∠AOD, but ∠AOB ≠ ∠AOD or ∠BOC, & ∠BOC ≠ ∠COD or ∠AOBThere are 1 ⋅ 4 such diagonals for the first type and 2 ⋅ 3 for the secind type of diagonal. In total this gives 7 ⋅ 4 + 7 ⋅ 6 = 70 intersections, but each is counted twice, so the answer is: 35. The general answer for odd (!) n would be. n 2 ∑ k = 1 n − 3 2 k ( n − k − 2) by a similar argument. Share. Classifying Polygons. A polygon is any closed planar figure that is made entirely of line segments that intersect at their endpoints. Polygons can have any number of sides and angles, but the sides can never be curved. The segments are called the sides of the polygons, and the points where the segments intersect are called vertices.Feb 23, 2023 · In a regular heptagon, all angles are equal, each measuring approximately 128.57 degrees. The total sum of the interior angles of any heptagon is always 900 degrees, regardless of whether it is regular or irregular. Diagonals. A heptagon has 14 diagonals, which are line segments that connect two non-adjacent vertices. Regular vs. Irregular ... Given an integer a which is the side of a regular heptagon, the task is to find and print the length of its diagonal. Approach: We know that the sum of interior angles of a polygon = (n – 2) * 180 where, n is the no. of sides in the polygon. So, sum of interior angles of heptagon = 5 * 180 = 900 and each interior angle will be 128.58 (Approx).

1. The Diagonal Product Formula. What are the lengths of the diagonals of a regular polygon with unit side length? As. FIGURE 1 shows, the triangle has no diagonals, the …

The formula obtained by subtracting n using nC2 methods is \ [\frac {n (n-3)} {2}\]. The total sides of a hexagon, for example, are six. As a result, the total diagonals are 6 (6-3)/2 = 9. Let’s know what a diagonal is. A diagonal of a polygon can be defined as a line segment joining two vertices. From any given vertex, there are no diagonals ...A diagonal is a pair of these points which are more than 1 1 apart, and it is parallel to an edge if their difference is odd. It's easier to pick diagonals which are not parallel - because you can pick any 2 2 nodes that are even labeled, or any two nodes that are odd-labeled. This means there are 2(n/2 2) = n(n−2) 4 2 ( n / 2 2) = n ( n − ...Diagonals of Polygons. A square has. 2 diagonals. An octagon has. 20 diagonals. A polygon 's diagonals are line segments from one corner to another (but not the edges). The number of diagonals of an n-sided polygon is: n (n − 3) / 2.Diagonals are the parts of a shape, in geometry. In Mathematics, a diagonal is a line that connects two vertices of a polygon or a solid, whose vertices are not on the same edge. In general, a diagonal is defined as a sloping line or the slant line, that connects to the vertices of a shape. Diagonals are defined as lateral shapes that have sides/edges and corners.Properties of Heptagon. 1. The sum of the interior angles of a heptagon is equal to 900 °. 2. The sum of the exterior angles of a heptagon is equal to 360 °. 3. A heptagon geometric shape can be divided into five triangles. 4. Heptagons have 14 diagonals. Examples of Heptagon 1. Storage BoxGiven N-sided polygon we need to find the total number of triangles formed by joining the vertices of the given polygon with exactly two sides being common and no side being common. Examples: Input : N = 6 Output : 6 2 The image below is of a triangle forming inside a Hexagon by joining vertices as shown above. The triangle formed has …To find the exact area of a heptagon or any polygon, using various methods, see Area of a Regular Polygon and Area of an Irregular Polygon Properties of all heptagons Number …Given an integer a which is the side of a regular heptagon, the task is to find and print the length of its diagonal. Approach: We know that the sum of interior angles of a polygon = (n – 2) * 180 where, n is the no. of sides in the polygon. So, sum of interior angles of heptagon = 5 * 180 = 900 and each interior angle will be 128.58 (Approx).

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The number of distinct diagonals possible from all vertices. (In general ½n (n–3) ). In the figure above, click on "show diagonals" to see them. See Diagonals of a Polygon. Number of triangles. 4. The number of triangles created by drawing the diagonals from a given vertex. (In general n–2).Aug 9, 2015 ... 2.- The heptagon diagonals. The Golden Ratio is the diagonal length of a unit edge pentagon. Similarly, we are going to show that the ...Oct 12, 2023 · A heptagon is a seven-sided polygon. It is also sometimes called a septagon, though this usage mixes a Latin prefix sept- (derived from septua-, meaning "seven") with the Greek suffix -gon (from gonia, meaning "angle"), and is therefore not recommended. A heptagon with vertices equally spaced around a circle and with all sides the same length is a regular polygon known as a regular heptagon. Given an integer a which is the side of a regular heptagon, the task is to find and print the length of its diagonal. Approach: We know that the sum of interior angles of a polygon = (n – 2) * 180 where, n is the no. of sides in the polygon. So, sum of interior angles of heptagon = 5 * 180 = 900 and each interior angle will be 128.58 (Approx).What is the number of diagonals drawn from one vertex on a heptagon? a heptagon has 7 sides. you cannot draw a diagonal to the 2 adjacent vertices, so 7-2 = 5. there would be 5 diagonals.A heptagon's interior angles add up to 900 degrees. A regular heptagon's interior angles have values of 128.57° each. A heptagon's external angles add up to 360 degrees. A heptagon may have a maximum of fourteen diagonals. A typical heptagon's central angle has a measurement of around 51.43 degrees.A diagonal is a pair of these points which are more than 1 1 apart, and it is parallel to an edge if their difference is odd. It's easier to pick diagonals which are not parallel - because you can pick any 2 2 nodes that are even labeled, or any two nodes that are odd-labeled. This means there are 2(n/2 2) = n(n−2) 4 2 ( n / 2 2) = n ( n − ...Jan 31, 2023 · Download Article. 1. Define the formula. The formula to find the number of diagonals of a polygon is n (n-3)/2 where “n” equals the number of sides of the polygon. Using the distributive property this can be rewritten as (n 2 - 3n)/2. You may see it either way, both equations are identical. Diagonals of convex nonagon. A diagonal is a line segment joining two non-consecutive vertices. A total of twenty-seven distinct diagonals can be drawn for a nonagon. The following figure is an example. There are 6 diagonals extending from each of the 9 vertices of the nonagon above creating a total of 27 diagonals. ….

A heptagonal triangle has vertices coinciding with the first, second, and fourth vertices of a regular heptagon (from an arbitrary starting vertex) and angles /, /, and / Thus its sides coincide with one side and two particular diagonals of the regular heptagon. See more1. A diagonal for a polygon is defined as the line segment joining two non-adjacent points. Given an n-sided polygon, how many different diagonals can be drawn for this polygon? I know that the number of diagonals is C (n,2). However, I don't know how to account for the fact that you can't draw a diagonal for two points that are adjacent to ...Reference.com - What's Your Question? Calculate the maximum number of diagonals that can be drawn in an octagon using the suitable formula. Easy. View solution > Find the maximum number of diagonals that can be drawn in n-sides polygon. Also, find number of diagonals if i. n=12 sides ii. n=15 sides iii. decagon. Easy. View solution >Sep 7, 2016 ... Diagonals of a Regular Heptagon. A heptagon is any seven-sided polygon (n = 7). Sometimes it is called a “septagon,” but “heptagon” is the ...The correct option is A. 20. An octagon has 8 vertices. The number of diagonals of a polygon is given by n(n−3) 2. ∴ Number of diagonals of an octagon. = 8(8−3) 2 = 20. Suggest Corrections. 0.Question: Determine how many diagonals each of the following polygons has. a. Heptagon b. Decagon c. 15-gon d. n-gon a. A heptagon has diagonals. b. A decagon has diagonals. c. A 15-gon has diagonals. d. A n-gon has diagonals. (Type an expression using n as the variable.) Jun 2, 2020 · In this video you will learn about the mathematical properties of a regular heptagon. A regular heptagon is a 7 sided shape with equal edges. It also has an ... Sep 26, 2019 · One can easily find the length of the diagonals of the heptagon using simple trigonometry and a calculator. Let the side length be x, angle between sides is ${\approx}128.56^{\circ}$ Length of shorter diagonal will be $2xsin({128.56\over 2})$ The longer diagonal can also be found similarly. I leave that as a challenge for you to do. Heptagon diagonals, Mar 27, 2021 ... English: This is a regular heptagon with two semi-transparent circles centered at the intersections of diagonals and tangent to other diagonals ..., In this case, a heptagon has seven sides, and thus (7 - 2) = 5 triangles can be drawn. ... By drawing all the diagonals from one vertex, the polygon is divided up into triangles. The sum of the interior angles of the polygon is equal to the sum of the internal angles in the triangles. With n vertices, each vertex is not directly connected to n ..., Correct option is C) A regular pentagon has 5 diagonals on the inside of the shape. The diagonals of any poygon can be calculated using the formula n× 2(n−3) where n is the number of sides, in case of a pentagon which "n" will be 5, the formula as expected is …, In a regular heptagon, all angles are equal, each measuring approximately 128.57 degrees. The total sum of the interior angles of any heptagon is always 900 degrees, regardless of whether it is regular or irregular. Diagonals. A heptagon has 14 diagonals, which are line segments that connect two non-adjacent vertices. Regular vs. Irregular ..., Answer link. There are seven lines of symmetry for a regular heptagon - those that intersect a center with each vertex. Below is an illustration of seven lines of symmetry for a regular heptagon:, Given an integer a which is the side of a regular heptagon, the task is to find and print the length of its diagonal. Approach: We know that the sum of interior angles of a polygon = (n – 2) * 180 where, n is the no. of sides in the polygon. So, sum of interior angles of heptagon = 5 * 180 = 900 and each interior angle will be 128.58 (Approx)., Formula for Number of Diagonals of a Polygon. This equation is obtained by adding the number of diagonals that each vertex sends to another vertex and then subtracting the total number of sides from it. For example, in a pentagon the total number of sides is five. Hence, the number of diagonals in them are 5 (5-3)/2 = 5., 7.) Assertion (A) – A heptagon have 14 diagonals. Reason (R) – a heptagon or septagon is a seven-sided polygon or 7-gon. a) Both A and R are true and R is the correct explanation of A. b) Both A and R are true but R is not the correct explanation of A. c) A is true but R is false. d) A is false but R is true. 8.), A heptagon's interior angles add up to 900 degrees. A regular heptagon's interior angles have values of 128.57° each. A heptagon's external angles add up to 360 degrees. A heptagon may have a maximum of fourteen diagonals. A typical heptagon's central angle has a measurement of around 51.43 degrees., Reference.com - What's Your Question? , If all the diagonals lie inside the heptagon, it is known as convex heptagon. If some of the diagonals lie outside of the heptagon and one or more interior angles are greater than 180 degrees, then the heptagon is known as concave heptagon. Heptagon Properties Some properties of heptagons are as follows:, Connecting the diagonals of a heptagon forms a heptagonal star (left); three triangles inscribed in an enneagon (right). It is important to distinguish between ..., A nonagon has 27 diagonals. Nonagon Diagonals. There are 27 diagonals in a nonagon. These diagonals are drawn by joining its non-adjacent vertices and the total number of diagonals in a nonagon can be calculated using the formula, Number of diagonals in a polygon = 1/2 × n × (n-3), where n = number of sides in the polygon. Here, n = 9., Perimeter. perimeter = n × a. Read more about polygon perimeter in the perimeter of a polygon calculator. Angles : α = (n - 2) × π / n, where α is an interior angle; β = 2 × π / n, where β is an exterior angle. If you're particularly interested in angles, you may want to take a look at our polygon angle calculator., A diagonal is a pair of these points which are more than 1 1 apart, and it is parallel to an edge if their difference is odd. It's easier to pick diagonals which are not parallel - because you can pick any 2 2 nodes that are even labeled, or any two nodes that are odd-labeled. This means there are 2(n/2 2) = n(n−2) 4 2 ( n / 2 2) = n ( n − ... , Jan 4, 2013 ... Circles, Tangents, and Heptagon Diagonals. Two circles are centered at intersection points of diagonals of a regular hepatgon., The diagonals are not perpendicular to each other; here diagonals AC & BD are not perpendicular The adjacent central angles at the point of intersection are not equal, but the opposite central angles are equal; here ∠AOB = ∠COD & ∠BOC = ∠AOD, but ∠AOB ≠ ∠AOD or ∠BOC, & ∠BOC ≠ ∠COD or ∠AOB, Step by step video & image solution for The number of diagonals that can be drawn by joining the vertices of a heptagon by Maths experts to help you in ..., 7.) Assertion (A) – A heptagon have 14 diagonals. Reason (R) – a heptagon or septagon is a seven-sided polygon or 7-gon. a) Both A and R are true and R is the correct explanation of A. b) Both A and R are true but R is not the correct explanation of A. c) A is true but R is false. d) A is false but R is true. 8.), http://bit.ly/tarversub Subscribe to join the best students on the planet!!----Have Instagram? DM me your math problems! http://bit.ly/tarvergramHangout with... , Properties of heptagon. A regular heptagon is a convex polygon. A heptagon has 7 sides. It has 7 interior angles. For a regular heptagon, the adjacent sides meet each other at an angle of 128.57°. It has 14 diagonals. The sum of all its interior angles is 900°., The correct option is D 14. In geometry, a heptagon is a seven-sided polygon or 7-gon. The heptagon is also occasionally referred to as the septagon. A heptagon has 14 diagonals. In geometry, a diagonal refers to a side joining nonadjacent vertices in a closed plane figure known as a polygon. Suggest Corrections., Given: Regular heptagon has 7 sides Formula Used: Number of diagonals = n (n - 3)/2 Calculation: Number of diagonals = n (n - 3)/2 n = 7&n. Get Started ... ∴ A regular heptagon has 14 diagonals. The correct option is 2 i.e. 14. Download Solution PDF. Share on Whatsapp Latest UPTET Updates., This is a step by step video of how to draw a heptagon by using a ruler and a compass.This is a seven-sided polygon., Find Heptagon Shape stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection. Thousands of new, high-quality pictures added every day. , Square, rectangle, rhombus, and trapezoid are examples of a convex quadrilateral. b) Concave Quadrilateral. It is a type of quadrilateral with at least one of its interior angles measuring greater than 180°. A concave quadrilateral has one of its diagonals outside the closed figure. Dart or arrowhead is an example of concave …, Properties Of A Regular Heptagon (Sides, Vertices, Diagonals, Reflectional Symmetry, Rotational) Maths Mark. 27.6K subscribers. 3.6K views 3 years ago Regular …, The Polygon Sum Formula states that for any n−gon, the interior angles add up to (n − 2) ×180∘ ( n − 2) × 180 ∘. Figure 5.27.2 5.27. 2. → n = 8 (8 − 2) 6 ×180∘ ×180∘ 1080∘ → n = 8 ( 8 − 2) × 180 ∘ 6 × 180 ∘ 1080 ∘. Once you know the sum of the interior angles in a polygon it is easy to find the measure of ONE ..., A heptagon is a shape which has 7 sides. (a) Draw a diagram to show the lines of symmetry of a regular heptagon. ... Which quadrilaterals have diagonals that are perpendicular to one another? Solution The square, rhombus and kite have diagonals that cross at right angles. of the same length opposite sides equal sides equal. MEP Y8 …, All heptagons have 14 diagonals (line segments connecting vertices), Diagonal. The body or space diagonal of a rectangular parallelepiped is the line segment connecting the two vertices not lying on the same face. The formula to calculate the space diagonal of a rectangular parallelepiped is given below: Diagonal (D) = √ (a2 + b2 + c2) , here a, b, and c are the three dimensions., A heptagon is a shape which has 7 sides. (a) Draw a diagram to show the lines of symmetry of a regular heptagon. ... Which quadrilaterals have diagonals that are perpendicular to one another? Solution The square, rhombus and kite have diagonals that cross at right angles. of the same length opposite sides equal sides equal. MEP Y8 …, The heptagon is sometimes referred to as the septagon, using "sept-" (an elision of septua-, a Latin -derived numerical prefix, rather than hepta-, a Greek -derived numerical prefix; both are cognate) together with the Greek suffix "-agon" meaning angle. In geometry, a heptagon or septagon is a seven-sided polygon or 7-gon.