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In a quadrilateral PQRS, $$\angle{S}$$ = 90°. A circle (o, r) touches the sides PQ, QR, RS and SP at A, B, C and D respectively. If QR= 38 cm, RS = 25 cm and QA = 27 cm, find 'r'.
16 cm
12 cm
14 cm
10 CM
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