An 8 sided octagon has 20 diagonals according to the formula 0.5*(n^2 -3n) whereas n is the number of sides of the polygon.
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An octagon has eight sides.
An Octagon has 8 sides
An octagon has 8 angles.An octagon has 8 angles.An octagon has 8 angles.An octagon has 8 angles.
A octagon has 8 sides.
None, if it is an irregular octagon.