one inner angle of a regular polygon is120degree
how many sides does it have?
what is the sum of inner angle?
what is the sum of outer angle?
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How many sides does a regular polygon have if each interior angle is 120? If in a regular polygon, each interior angle = 120 deg, then each exterior angle = 180–120 = 60 deg. So the polygon has 360 deg/60 deg = 6 sides. The figure is a regular hexagon.
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