Question

The volume of a cylinder is $330$ cm${}^3$. If the length of the cylinder is $4$ cm, calculate the radius of the cross section. $(\pi =3.142)$

• A. $5.12cm$
• B. $7.12cm$
• C. $4.12cm$
• D. None of these

Answer 1

The correct option is A $5.12cm$

$V=\pi r^{2}h\Rightarrow r=\sqrt{\frac{V}{\pi h}}=\sqrt{\frac{330}{\pi \times 4}}=5.12cm$