<PRE><B>Question 603667</B>
sum of the interior angles of an n-sided convex polygon is (n-2)180 degrees
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Your problem:
sum of interior angles = (20-2)*180 = 18*180 = 3240 degrees
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Try it with a smaller number of sides to see how it works.
3 sides: (3-2)180 = 180 ; that is a triangle
4 sides: (4-2)180 = 360 ; that could be a square
5 sides: (5-2)180 = 540 ; that could be a pentagon
etc.
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Cheers,
Stan H.</PRE>