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An 18 gon has how many diagonals?

Updated: 4/28/2022

Wiki User

∙ 13y ago

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FORMULA: (n [squared] -- 3n) / 2 (18 [squared] -- 3 x 18) / 2 = (324 -- 54) / 2 = 270 / 2 = 135 Easy as Pi ;)

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∙ 13y ago

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Continue Learning about Geometry

How many diagonals in 18-gon?

Using the diagonal formula: 0.5*(182-54) = 135 diagonals

How many diagonals are in a 24-gon?

252 diagonals

How many diagonals in a 15-gon?

0.5*(152-45) = 90 diagonals

How many diagonals in 25-gon?

There are 275 diagonals in a 25 sided polygon

How many diagonals in a regular 46-gon?

many triangles does a regular 46-gon have

Related questions

How many diagonals in 18-gon?

Using the diagonal formula: 0.5*(182-54) = 135 diagonals

How many diagonals are in a 24-gon?

252 diagonals

How many diagonals are in a 17-gon?

There are 119 diagonals.

How many diagonals does a 33-gon have?

It has 495 diagonals.

How many diagonals of a 12-gon have?

It has 54 diagonals

How many diagonals are in a 20-gon?

170

How many diagonals does the 13 gon?

78

How many diagonals are in a 11- gon?

There are 44 diagonals in an 11 sided undecagon

How many diagonals in a 15-gon?

0.5*(152-45) = 90 diagonals

How many diagonals does a 20 gon has?

A 20 sided polygon has 170 diagonals

How many diagonals in 25-gon?

There are 275 diagonals in a 25 sided polygon

How many diagonals are in a 39-gon?

39*36/2 = 702 diagonals.

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An 18 gon has how many diagonals?

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