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Question

Using the exterior angle property, find the value of y from the figure.


A
80
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B
100
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C
20
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D
50
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Solution

The correct option is B 100

APQ=PQR
[Alternate angles are equal]
50 =PQR

By exterior angle property,
PQR+QPR=PRD
50 + y=150
y=15050=100
y=100

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