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Question

In the given construction of a ΔABC, CAB will be

A
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B
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C
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D
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Solution

The correct option is B
From construction
BAX=AXB(In ΔAXB,AB=XB, since PQXA)ABC=BAX+AXB=2AXB=LXY [Since, AXB is angle bisector of LXY]Similarly, ACB=MYXTherefore, ABC=75 and BCA=60In ΔABC, we haveABC+BCA+CAB=18075+60+CAB=180CAB=180135CAB=45

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