Q. 16 A55.0( 2 Votes )

The centre of two concentric circle is O; a straight line intersects a circle at the points A and B and other circle at the points C and D. If AC = 5 cm. then the length of BD is
A. 2.5 cm

B. 5 cm

C. 10 cm

D. none of these

Answer :


In OAP and OBP


AP = BP


OA = OB


OP = OP


In OCP and ODP


CP = DP


CA + AP = BP + DB


CA = DB + BP-AP


CA = DB + 0


CA = DB


So, BD = 5cm

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