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Question

In a triangle ABC, AB=AC and B = 30. Then value of A is .

A
20
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B
30
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C
40
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D
50
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Solution

The correct option is C 40
Since AB = AC, the angles opposite these sides will also be equal.

Hence, B=C

C=30
Now using angle sum property
A+B+C=180
A+30+30=180
A+60=180
A=120

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