Question

The radius of the circle whose arc of length 15 π cm makes an angle of 3π/4 radian at the centre is 

A. 10 cm 

B. 20 cm 

C.11\(\frac1{4}\) cm 

D. 22\(\frac1{4}\) cm 

Answer 1

Here, arc length l=15π cm 

Angle θ = \(\frac{3π}4\)

We know, angle subtended by the arc is given by,

θ = \(\frac{length\,of\,arc}{radius}\)