Q.

A circular arc is of length π cm. Find angle subtended by it at the centre in radian and degree.

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a

90°

b

30°

c

60°

d

45°

answer is B.

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Detailed Solution

θ=sr=πcm6 cm=π6rad=30°As 1rad=180°π So,   θ=π6×180°π=30°
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A circular arc is of length π cm. Find angle subtended by it at the centre in radian and degree.