SOLUTION: if the angles of a concave polygon are 30, 60, 90..., then the number of diagonals of polygon is?

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Question 707733: if the angles of a concave polygon are 30, 60, 90..., then the number of diagonals of polygon is?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
if the angles of a concave polygon are 30, 60, 90..., then the number of diagonals of polygon is?
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If there are only three angles, the figure
is a triangle.
Thee are no diagonals in a triangle.
Cheers,
Stan H.