Question

The angle subtended by an arc of length 11 cm at the centre of a circle of radius 7 cm

is

(a) 600

(b) 700

(c) 800

(d) 900​

Answer 1

Angle=arc length/radius=l/r=11/7=1.5714 radians
Now 1 radian = 180 degrees/pi
Therefore 1.5714 radians= (180*1.5714)/pi=90 degrees(approximately)