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## Answers

where n is no of sides.

here n = 8

substitute values

we have,

8×5/2 = 20

so octagon has 20 diagonals

where

n=sides

octagon has 8 sides

its equals to [8(8-3)]/2

so [40]/2

so answer is 20

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where n is no of sides.

here n = 8

substitute values

we have,

8×5/2 = 20

so octagon has 20 diagonals

where

n=sides

octagon has 8 sides

its equals to [8(8-3)]/2

so [40]/2

so answer is 20