If the hexagon isn't regular, then all you know about it is the sum of the
interior angles ... 720 degrees.
If it's a regular hexagon, with six equal sides and six equal angles, then
-- sum of interior angles = 720 degrees
-- each interior angle = 720/6 = 120 degrees
-- each exterior angle = (180 minus the interior angle) = 60 degrees.
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Each pair of interior and exterior angle sums to 180 degrees. Since a hexagon has 6 such pairs, the sum is 6*180 = 1080 degrees.
The interior and exterior angles add up to 180.
The interior and exterior angles add up to 180.
Int 120, ext 60
Each exterior angle = 630/6 = 60 degrees. So each interior angle = 180 - 60 = 120 degrees.