Question

The diameter of a garden roller is $1.4m$ and it is $2m$ long. How much area will it cover in $5$ revolution?

Answer 1

Diameter = 1.4 m

$r=\frac{d}{2}$

$r=\frac{1.4}{2}$

$r=0.7$ m

Curved surface area of cylinder $=\pi$$r^{2}h$

$=\frac{22}{7}\times 0.7\times 0.7\times 2$

$=8.8m^2$

No of revolutions $=5$

ATQ,

$=8.8\times 5$

$=44m^2$