A 40-sided polygon has 40 sides. Count again, to be sure.
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If its a regular 9 sided polygon then the exterior angles are 40 degrees.
It is called Tetracontagon.
It has 40 diagonals.Improved Answer:-Using the formula for diagonals of a polygon: 0.5*(442-132) = 902 diagonals
40 lines.40 lines.40 lines.40 lines.
40