In Fig. 9.25, ∠ ABC = 69°, ∠ ACB = 31°, find ∠ BDC.
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. 9.27). Prove that ∠ACP = ∠ QCD.
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