Question

The circumference of the base of a right circular cylinder is 314 cm . Find its volume of its height is 21 cm.​

Answer 1

We know that,

$c = 2 \: \pi \: r \\ = > 314 = 2 \times 3.14 \times r \\ = > r = 314 \times \frac{1}{2} \times \frac{1}{3.14} \\ = > r = \frac{10}{2} \\ = > r = 5 \: cm$

Again,

$volume \: of \: cylinder \\ = \pi {r}^{2}h \\ = 3.14 \times 5 \times 5 \times 21 \\ = 3.14 \times 25 \times 21 \\ = 1648.5 \: {cm}^{3}$

I HOPE YOU WILL MARK ME AS BRAINLIEST ❣