Question

Find the total surface area of the cylinder whose radius is $7m$ and the height of the cylinder is $15cm.$

Answer 1

Given: Radius, $r=7m$

And, Height, $h=15m$

The cylinder have $2$ circular faces and its round surface.

Area of circular faces $=2\left(\pi r^2\right)$

Area of round surface $=2\pi rh$

Total surface area of a cylinder $=2\pi rh+2\pi r^2$

$=2\pi r(h+r)$

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

$=2\times 22\times 22$

$=968m^2$