Correct Answer: Option C

Explanation

The sum of interior angle of pentagon

(5 sides) = (2n - 4) x 90^o

n = 5

(2 x 5 - 4) x 90^o = 6 x 90^o

= 540^o

540^o - 60^o = 480^o \(\div\) 4

= 120^o

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