Question

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

Answer 1

r= 7.09 cm (3s.f.)

Explanation:

`\boxed{volume \: of \: cyinder = \pi {r}^(2)h }`

Given: h= 5cm, volume= 80cm³

πr²(5)= 80

Divide both sides by 5π:

`{r}^(2) = (80)/(5\pi)`

Simplify:

`{r}^(2) = 16\pi`

Square root both sides:

`r = √(16\pi)`

r= 7.09 cm (3s.f.)