Question

If the cylinder with height $2cm$ has a volume of $8\pi c{m}^3$ then, the radius of the cylinder is.

• A. $6cm$
• B. $4cm$
• C. $2cm$
• D. $8cm$

Answer 1

The correct option is C $2cm$

We know that,
Volume of the cylinder
$=\pi r^{2}h$

Given that,
Height of the cylinder is $2cm$.
Volume of the cylinder is $8\pi$.

Now,
$\pi r^{2}h=8\pi$
$\Rightarrow \pi r^2\left(2\right)=8\pi$
$\Rightarrow r^2=4$
$\Rightarrow r=2cm$