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Question

AB, BC and CD are the three consecutive sides of a regular polygon. If BAC=15. Find each interior angle of the polygon.

A
147
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B
162
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C
150
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D
140
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Solution

The correct option is D 150
AB, BC and CD are three consecutive sides of a regular polygon and BAC=15o,
In BAC,AB=BC,
Therefore, BCA=BAC=15o (Isosceles Triangle)
Now,
BCA+BAC+ABC=180o
15o+15o+ABC=180o
ABC=150o
Each interior angle = 150o

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