The chord ST of a circle is equal to the radius, r, of the circle. Find the length of arc ST.
- πr/6
- πr/2
- πr/12
-
πr/3
The correct answer is: D
Explanation
Since ST = the radius r, => SOT is equilateral.Each angle = 60°
Length of arc ST = θ/360 x 2πr
= 60/360 x 2 x π x r = πr/3
There is an explanation video available .