A sector of circle of radius 7.2cm which substends an angle of 300\(^o\) at the centre is used to form a cone. What s the radius of the base of the cone?
A
8cm
B
9cm
C
6cm
D
7cm
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
r = radius of the cone's base, R = radius of the circle
r = \(\frac{R \theta}{360}\) = \(\frac{7.2 \times 300}{360}\) = 6cm
Source: Myschool Past Questions Archive (Record #56849)