Question

Find the volume and total surface area of a right circular solid cylinder whose radius and height are $7$ cm and $30$ cm, respectively.

Answer 1

Given

Radius $=7cm$

Height $=39cm$

Volume $=\pi r^{2}h$

$=\frac{22}{7}\times 7\times 7\times 30$

$=154\times 30$

$=4620c{m}^3$

Now, Total surface area of the cylinder $=2\pi r(r+h)$

$=2\times \frac{22}{7}\times 7\times (7+10)$

$=44\times 17$

$=748c{m}^2$.