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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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Earn +20 ptsQ: An 18 gon has how many diagonals?
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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 does a 33-gon have?
It has 495 diagonals.
How many diagonals are in a 17-gon?
There are 119 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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