Question

for two concentric circle of the radius 25 cm and 7 cm ​

Answer 1

Radius of small circle=7cm

Radius of big circle=25cm

find AB=?

BC=AB/2 (OC perpendicular AB)

In∆OCB

BC²=(25²-7²)

BC²=25-49

BC=√576

BC=24cm

therefore, BC=24cm.

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