Question

Question 9 (ii)
A right circular cylinder just encloses a sphere of radius r (see figure). Find:

(ii) curved surface area of the cylinder.

Answer 1

(ii) Height of the cylinder = r + r = 2r

Radius of the cylinder = r

CSA of the cylinder $=2\pi rh=2\pi r\left(2r\right)$

$=4\pi r^2$