Question

$v = 66 \: {cm}^{3}$
$7 = cm$
what is value of r?
look at the pic​

Answer 1

✎ANSWER⇩⇩

✛GIVEN::-

$V = 66cm^3$

$h= 7cm$

TAKING π AS 22/7

✛TO FIND::-

$radius=??$

✛FORMULA USED::-

$V = \: \frac{1}{3} \pi r^2h$

✛LET'S DO IT ::-

$V = \frac{1}{3} \pi r^2h$

PUT THE VALUES

$66 = \frac{1}{3} \times \frac{22}{7} \times {r}^{2} \times 7$

$66 = \frac{1}{3} \times 22 \times {r}^{2}$

$\frac{66 \times 3}{22} = {r}^{2}$

$\frac{ \cancel{66} \times 3}{ \cancel{22}} = {r}^{2}$

$\frac{ \cancel{6} \times 3}{ \cancel{2}} = {r}^{2}$

${r}^{2} = 9$

$r = \sqrt{9}$

$r = \pm{3}$

AS RADIUS CAN'T BE NEGATIVE SO,

$\boxed{ : \longrightarrow \pink {r = 3}}$

$\dag\purple{HOPE \: \: IT \: \: HELPS}\dag$