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How many diagonals does a decagon have?

Updated: 8/19/2023

Wiki User

∙ 15y ago

Best Answer

1oo diagonals, because 1 side has 10 diagonals so 10 sides (10x10) = 100 diagonals! This is the correct answer..... a decagon has 35 diagonals. The equation for the this is D=n(n-3)/2 meaning diagonals = number of sides (N) multiplied by number of sides minus 3. and that number over 2. D=10(10-3)/2

Wiki User

∙ 15y ago

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Wiki User

∙ 7y ago

A diagonal line of a polygon is a line that joins any two vertices not already joined by a side.

A polygon with n sides has n(n-3)/2 diagonals

→ a hexagon has 6(6-3)/2 = 6 × 3 ÷ 2 = 9 diagonals

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Wiki User

∙ 11y ago

35

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