###### Asked in Math and ArithmeticAlgebraGeometry

Math and Arithmetic

Algebra

Geometry

# How many diagonals does a octagon have?

## Answer

###### Wiki User

###### 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.

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