Question

Curved surface of right circular cylinder is $4.4m^2$, radius of base is $0.7m,$ then the height is $(\text{Take}\pi =\frac{22}{7})$:

• A. $1$ m
• B. $2$ m
• C. $3$ m
• D. $4$ m

Answer 1

The correct option is A $1$ m

Curved surface area of a cylinder of radius "$R$" and height $"h$" is $2\pi Rh$.

Given, curved surface area $=44,4$ $m^2$
Therefore, CSA of the given cylinder $=2\times \frac{22}{7}\times 0.7\times h=4.4$ sq.cm

$\Rightarrow \frac{44}{10}=\frac{44}{7}\times \frac{7}{10}\times h$

$\Rightarrow h=1$ m

Hence, option 'A' is correct.