The chord ST of a circle is equal to the radius, r, of the circle. Find the length of arc ST.
-
A.
πr/6 -
B.
πr/2 -
C.
πr/12 -
D.
πr/3
Correct Answer: Option 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