Question

Find the curved surface area and the total surface area of a right circular cylinder whose height is 15 cm and the diameter of the cross-section is 14 cm.

Answer 1

Diameter $=14cm$

Radius $=7cm$

Height $=15cm$

So,

TSA of cylinder $=2\pi r(r+h)$

$=2\times \frac{22}{7}\times 7(7+15)$

$=2\times \frac{22}{7}\times 7\times 22$

$=968c{m}^2$

CSA of cylinder $=2\pi rh$

$=2\times \frac{22}{7}\times 7\times 15$

$=660c{m}^2$