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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 Figure). Prove that `/_A C P=/_Q C D`.

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angles substended by arc AD on same side are equal.
`/_ACP=/_ABP` are QD angles subtended by arc QD on same side`/_QCD=/_QBP`.
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