The interior angles of a pentagon are 126o, 114o, y, 92o and 83o. Find the value of y.

A.

85o

B.

95o

C.

105o

D.

115o

E.

125o

View answer & explanation

Correct answer is E

Sum of the angle of a pentagon
= (2 x 5 - 4) x 90
= 540o
126 + 114 + y + 92 + 83 = 540
y = 540 - 415 = 125o

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