Question

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

centre is

(a) 10cm (b)20cm (c)11 1

4

cm (d) 221

2

cm​

Answer 1

Answer:

20 cm

Step-by-step explanation:

angle = 3/4 radian = 3/4 * 180/π

= (135/π)°

length of arc = 15 cm

r × thita × π/180 = 15

r × 135/π * π/180 = 15

r = 60/3 = 20 cm,option (b) is √

Answer 2

option B

Step-by-step explanation:

Angle=3/4rad

=3/4*180/π=135/π

l=15cm

r*135/π*π/180=15

r=60/3=20cm