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Question

If each interior angle of a regular polygon is 120 degrees then the polygon is ?
a) Triangle
b) Pentagon
c) Hexagon
d) Nonagon

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Solution

Let n be the number of sides of regular polygon.Now, measure of each interior angle = sum of all interior anglesn120° = n-2×180°n120n = 180n - 360-60n = -360n = 36060 = 6So, number of sides of regular polygon = 6So, the polygon is hexagon.

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