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Question

If the circumcircle of an isosceles triangle ABC is equal to AB=AC, then the angle A is

A
π6
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B
π3
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C
π2
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D
2π3
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Solution

The correct option is D 2π3
InΔPQRPC=CR=CQ=RPC=PRPC=PR=CRΔPCRisanequilateralΔCPR=60ΔPCQisanequilateralΔCPQ=60P=CPQ+CPR=120
1152684_1101854_ans_0f6721b9dd1142f9b75e82379f17f5e3.jpg

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