Question

The height of a right circular cylinder is $7cm$ and radius is $3cm$. Find its curvedsurface area, total surface area and volume.

Answer 1

Given :Height of cylinder $\left(h\right)=7cm$

Radius of base $\left(r\right)=3cm$

Curved surface area of cylinder $=2\pi rh$

$=2\times \frac{7}{5}\times 3\times 7$

$=22\times 6$

$=132{cm}^2$

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

$=2\times \frac{22}{7}\times 3(7+3)$

$2\times \frac{22}{7}\times 3\times 10$

$=\frac{1320}{7}$

$=188.57{cm}^2$

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

$=\frac{22}{7}\times 3\times 3\times 7$

$=22\times 3\times 3$

$=198{cm}^3$

Hence, curved surface area of cylinder $=132{cm}^2$

Total surface area $=188.57{cm}^2$ and

Volume $=198{cm}^3$