Question

The cylinder below has a volume of 80 cm³. what is the value for r?​

Answer 1

Answer:

r= 7.09 cm (3s.f.)

Step-by-step explanation:

$\boxed{volume \: of \: cyinder = \pi {r}^{2}h }$

Given: h= 5cm, volume= 80cm³

πr²(5)= 80

Divide both sides by 5π:

${r}^{2} = \frac{80}{5\pi}$

Simplify:

${r}^{2} = 16\pi$

Square root both sides:

$r = \sqrt{16\pi}$

r= 7.09 cm (3s.f.)