the formula for an n-sided polygon to find it's interior angle is (n-2)180/n so
the answer is 156 degree's.
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Each interior angle will measure 162 degrees
It is: 180-exterior angle = interior angle because there are 180 degrees on a straight line
120°
A regular trapezoid (!) is a square. And each interior angle of a square is 90 degrees.
Each interior angle of a regular 8 sided octagon measures 135 degrees