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Math and Arithmetic
Algebra
Geometry

How many diagonals does a octagon have?

Answer

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June 15, 2015 9:29AM

20 diagonals For any n-sided polygon, the formula for the number of diagonals is (n/2) x (n-3), so for an octagon it is (8/2) x (8-3) = 4 x 5 = 20.