Question

A right circular cone has a height of 9 cm, and a volume of 108π cm3. What is r (the radius of the cone)?

Answer 1

6 cm

Explanation:

`π {r}^(2) (h)/(3) = V \\ \\ 108π = π{r}^(2) (9)/(3) \\ \\ 108π = π{r}^(2)(3) \\ \\ 36π = πr^(2) \\ \\ 6 = r`

* When we are talking about radii, we want the NON-NEGATIVE root.

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