Quick Answer: How Many Diagonals Does A 9 Sided Polygon Have?

How many diagonals does a 20 sided polygon have?

170In a 20-sided polygon, the total diagonals are = 20(20-3)/2 = 170.

But, since one vertex does not send any diagonals, the diagonals by that vertex needs to be subtracted from the total number of diagonals.

In a polygon, it is known that each vertex makes (n-3) diagonals..

How many angles does a 9 sided polygon have?

Excellent! So the interior angle of a 9 -sided polygon is 140 ° ….Solve the Question.Interior Angle of a Polygon=180 ° · Number of Triangles Number of VerticesInterior Angle of a Polygon=9 · 20 ° · 7 9‌‌6 more rows

What is a 10 sided shape?

In geometry, a decagon is a ten-sided polygon or 10-gon.

How many diagonals does a 30 sided polygon have?


How many diagonals does a 21 sided polygon have?

171Generally the # of diagonals in sided polygon equals to : choose any two vertices out of to connect minus sides, which won’t be diagonals. So, # of diagonals in 21 sided polygon is . Since the diagonals from 1 particulat vertex shouldn’t be counted then (one vertex makes diagonals). Answer: 171.

What is a 35 sided polygon called?

triacontakaipentagonExample: A 35-sided polygon is called a “triacontakaipentagon.”

How many diagonals are in a hexagon?

9 diagonalsAnswer and Explanation: A hexagon has 9 diagonals. A diagonal of a polygon is a line segment that runs from one vertex of the polygon to another vertex, excluding the sides…

How many diagonals does an eighteen sided polygon have?

12 diagonalsTherefore it will have 18-6=12 diagonals. Manonamission wrote: How many diagonals does a polygon with 18 sides have if three of its vertices, which are adjacent to each other, do not send any diagonals? Each vertex makes a diagonal with n-3 other vertices. So each vertex will make 15 diagonals.

Can a hexagon be any shape with 6 sides?

In geometry, a hexagon (from Greek ἕξ hex, “six” and γωνία, gonía, “corner, angle”) is a six-sided polygon or 6-gon. … The total of the internal angles of any simple (non-self-intersecting) hexagon is 720°.

Is the radius of a hexagon equal to the side?

The radius of a hexagon is equal to the length of one side. Because of this, a regular hexagon can be broken into six equilateral triangles.

What is the diagonal of regular hexagon?

To find the diagonals of hexagons, use the formula: n (n-3)/2, where n is the number of sides of a polygon. For a hexagon, n = 6, and 6 (6-3) / 2 equals nine diagonals. A regular hexagon shape has a radius that equals the side length.

What’s a 6 sided shape called?

hexagonMore than Four Sides A five-sided shape is called a pentagon. A six-sided shape is a hexagon, a seven-sided shape a heptagon, while an octagon has eight sides…

How many diagonals does a 10 sided polygon have?

35 diagonals1. How many diagonals of a regular decagon (a 10 sided polygon) are not parallel to any of the sides (AMC12)? A decagon has (10 2) – 10 = 35 diagonals. Each pair of opposing sides has three diagonals which are parallel to them, so 5*3 = 15 of the diagonals are parallel to a side.

How many diagonals does a 7 sided polygon have?

Classifying PolygonsPolygon NameNumber of SidesNumber of DiagonalsPentagon55Hexagon69Heptagon714Octagon8?7 more rows•Jul 18, 2012

What is the maximum number of distinct diagonals in a hexagon?

Hexagon (6 sides): n(n-3)/2 = 6(6-3)/2 = 6*3/2 = 18/2 = 9 diagonals.

How many diagonals are in a 35 sided polygon?

of sides of the polygon. n = 10 or -7. Hence the figure has 10 diagonals and is a decagon.

What do you call a 9 sided shape?

In geometry, a nonagon (/ˈnɒnəɡɒn/) or enneagon (/ˈɛniəɡɒn/) is a nine-sided polygon or 9-gon.

How many diagonals does a 12 sided polygon have?

54 diagonalsSoooooooo we can draw 54 diagonals in a 12 sided figure.