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How many triangles are formed by the diagonals in a 21 sided polygon?

Updated: 4/28/2022

Wiki User

∙ 12y ago

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The number of triangles formed by the diagonals of a 21 sided polygon is C(21,3) = 21x20x19/3x2x1 = 1,330.

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∙ 12y ago

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Continue Learning about Other Math

How many triangles will be formed in 100 sided polygon if the diagonals are drawn from a single vertex?

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How many diagonals in a 15 sided polygon?

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How many diagonals are in a 7 sided polygon?

A 4-sided polygon has 2 diagonals. A 5-sided polygon, 5. 6-sided, 9. By induction, an n-sided polygon has 'n*(n-3)/2' diagonals. "n" is how many sides a shape has. so, (7)*(7-3)/2 now we have, 7*4/2 so, 28/2 = 14 Therefore, a 7-sided polygon would have 14 diagonals.

How many diagonals does a 44 sided polygon has?

It has 40 diagonals.Improved Answer:-Using the formula for diagonals of a polygon: 0.5*(442-132) = 902 diagonals

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What is the name of a regular polygon that has 95 diagonals?

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How many triangles are formed by the diagonals in a 21 sided polygon?

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