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The length of an arc of a circle of radius 3.5 cm is  1...

The length of an arc of a circle of radius 3.5 cm is  11936 cm. Calculate, correct to the nearest degree , the angle substended by the centre of the circle. [Take π=227

A.

55o

B.

36o

C.

25o

D.

22o

Correct answer is C

L = θ360o = 2π

5536=θ360o×2×227×3.5

θ=360×55×44×0.53×44×0.5

= θ=25o