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
Correct Answer: Option A
Explanation
(frac{Q}{360}) = (frac{r}{L})
(frac{300}{360}) = (frac{r}{7.2})
r = (frac{300 times 7.2}{360})
= 8cm
There is an explanation video available below.