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Question

In the given figure, quadrilateral ABCD is circumscribed, touching the circle at P, Q, R and S. If AP = 5 cm, BC = 7 cm and CS = 3 cm, AB = ?


(a) 9 cm
(b) 10 cm
(c) 12 cm
(d) 8 cm

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Solution

(a) 9 cm
Tangents drawn from an external point to a circle are equal.So, AQ=AP=5 cmCR=CS=3 cm and BR=BC-CRBR=7-3 cmBR=4 cmBQ=BR=4 cmAB=AQ+BQAB=5+4 cmAB=9 cm

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