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 isA. 2.5 cmB. 5 cmC. 10 cmD. 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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