A sector of a circle of radius 7.2cm which subtends an angle of 300° at the centre is used to form a cone. What is the radius of the base of the cone?
-
A.
8cm -
B.
6cm -
C.
9cm -
D.
7cm
Correct Answer: Option B
Explanation
(r/L) = (θ/360°)
Given θ = 300, and L = 7.2cm,
=> r = (300 x 7.2)/360
r = 6cm