27. A and B are the centres of two unequal circles which intersect at P and Q respectively as shown in figure. Prove that ∠PAB = ∠QAB. Also show that M is the mid-point of PQ and angles at M are at right angles.


28. In figure, M is the mid-point of arc APB. Show that ∠BOA = 4 × ∠BAM.

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