A sector of a circle of radius 7.2cm which subtends an angle of 300^\circ 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
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
(r/L) = (\theta/360^\circ)
Given \theta = 300, and L = 7.2cm,
=> r = (300 x 7.2)/360
r = 6cm
Source: Myschool Past Questions Archive (Record #1155)