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Q.

Find the sum of interior angles of a regular pentagon. 

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a

1260° 

b

540° 

c

840°  

d

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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