Question

A roller $2m$ long and $0\cdot 7m$ in diameter makes $60$ revolution in a minute on a road. How much area is rolled by it?

Answer 1

Length $\Rightarrow 2m$

Diameter = $0.7m=0.35$

No. of Revolution = 60

Area $\Rightarrow$ No. of Revolution $\times \left(2\pi rh\right)$

$\Rightarrow 60\times 2\times \frac{22}{7}\times \frac{35}{100}\times 2$

$\Rightarrow 12\times 22$

$=264m^2$ (unit : $m^2$)