Here's the question you clicked on:
ashley_fay
what is the sum of the measures of the interior angle of a regular polygon if each exterior angle measures 120 degrees?
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That's just an example. But for regular polygons, the interior + exterior angles = 180.
So if the exterior angles are 120 then the interior must be 60.
And like hero said, 360 divided by the exterior angle measurement gives you the number of sides or angles. So 360/120 = 3 so the sum of the interior angles must be 60x3.
Yeah. Cause only triangles have 60 degree interior angles.
And triangles have 180 degrees inside them.