Question

How do you find the lengths of the arc on a circle of radius 20 centimeters intercepted by the central angle `pi/4` radian?

Answer 1

Length of arc is `15.71 (2dp)` cm.

Explanation:

Length of arc is `l = r*theta` where `r` is radius and `theta` is central angle in radian. `r=20 , theta = pi/4 :. l = 20 * pi/4 = 5* pi = 15.71 (2dp)` cm

Length of arc is `15.71 (2dp)` cm. [Ans]