The sum of the internal angles of an n-gon is (n-2)*180 degrees.
So (n-2)*180 = 720
ie (n-2) = 4 or n = 6 ie a hexagon
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It is a 6 sided hexagon whose interior angles add up to 720 degrees
This polygon has 720 degrees.
6 sides
6
hexagon which has 6 sides