Question

Find the area of curved surface and total surface area of the cylinder whose heights and radii are given below:
$h=12cm,r=7cm$

Answer 1

Curved surface area

$=2\pi rh$

$=2\pi \times 12\times 7$

$=168\pi =168\times \frac{22}{7}=24\times 22=528{cm}^2$

Total surface area

$=CSA+{2\pi r}^2$

$=528+2\pi \times 7\times 7$

$=528+(2\times 7\times 22)$

$=528+308=836{cm}^2$

Hence, this is the answer.