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Question

In the figure, P is the centre of the circle. Two chords AB and CD are parallel to each other. Prove CPA=DPB.

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Solution

Consider ΔOPC and ΔOPD
Since, OP=OP as a common side.
POC=POD [Right angle]
PC=PD
Thus, ΔPOCΔPOD from RHS Criterion
So, OPC=OPD.....(i)
Similar way, we can prove ΔLPAΔLPB
So, LPA=LPB.....(ii)
From equation(ii)-equation(i), we get
LPAOPC=LPBOPD
CPA=DPB


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