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A circular wire of radius 7 cm is cut and bend again into an arc of a circle of radius 12 cm.

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A circular wire of radius 7 cm is cut and bend again into an arc of a circle of radius 12 cm. The angle subtended by the arc at the centre is

(A) 50° 

(B) 210° 

(C) 100° 

(D) 60°

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Best answer

(B) 210° 

Radius of circular wire = 7 cm 

∴ length of circular wire = 2πr = 14 π cm 

Now, S = 14π, R = 12

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