A pentagon has four of its angles equal. If the size of the fifth angle...

JAMB 1980

A pentagon has four of its angles equal. If the size of the fifth angle is 60^o, Find the size of each of the four equal angles.

A. 60^o
B. 108^o
C. 120^o
D. 150^o
E. None of the above

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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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A pentagon has four of its angles equal. If the size of the fifth angle...

Correct Answer: Option C

Explanation

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