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Question

ABCD is a parallelogram. AP the bisector of ∠A and CQ the bisector of ∠C meet the opposite sides in P and Q, respectively. Prove that
AP || CQ.

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Solution



Given: In a parallelogram ABCD, AP is bisector of A and CQ is the bisector of C.To prove: APCQProof:As, PAQ=12BAD Since, AP is bisector of AAnd, PCQ=12BCD Since, CQ is bisector of CBut BAD=BCD Opposite angles of parallelogramABCDor 12BAD=12BCDSo, PAQ=PCQBut PCQ=BQC Alternate interior anglesPAQ=BQCBut these are corresponding angles for the pair of lines AP and CQ.Hence, APCQ

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