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Question

Two circles intersect at two points B and C. Through B, two line segments ABD and PBQ are drawn to intersect the circles at A,D and P,Q respectively (see Fig.) Prove that ACP=QCD.

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Solution

For chord AP
PBA=PCA (angle in same segment from common chord)
For chord DQ
DBQ=DCQ (angle in same segment from common chord)
Also,
PBA=DBQ (opposite angles)
Hence, PCA=DCQ=PBA=DBQ
or ACP=QCD

906050_878822_ans_26264cee8b9048afac5a2c34358711ac.png

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Circles and Their Chords - Theorem 1
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