 Find the sum of interior angles of a regular pentagon.

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1260°

540°

840° 

1060°

answer is B.

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Detailed Solution

A pentagon has five sides.

Therefore, by the angle sum formula we know; S = (n − 2) × 180°

Here, n = 5

Hence, Sum of angles of pentagon = (5 − 2) × 180°

                                                           S = 3 × 180°

                                                           S = 540°

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