Question

if radius of the circle 6 cm and the angle at the centre of the circle by 30 degree then its Arc length equal to​

Answer 1

Answer:

First, you should know that the circumference of a circle is  2πr  — which, if you think about it, is the arc length subtended by the entire  360∘  circle  (70∘=70∘/360∘=19.4¯%  of a circle).

So, in general, the arc length subtended by a central angle  θ  in a circle of radius  r  is  2πrθ360∘,  

if  ∠θ  is expressed in degrees. The solution is even simpler if  θ  is in radians; per the arc length formula,

s=rθ.