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The volume of a cone with a radius of 7 cm is [tex]147 \pi[/tex] cubic centimeters. Which expression can be used to find [tex]h[/tex], the height of the cone?



A. [tex]147 \pi = \frac{1}{3}(7)(h)^2[/tex]



B. [tex]147 \pi = \frac{1}{3} \pi\left(7^2\right)(h)[/tex]



C. [tex]147 \pi = \frac{1}{3} \pi h[/tex]



D. [tex]147 \pi = \frac{1}{3} \pi(7)(h)[/tex]

Answer :

The volume of a cone is given by the formula

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

where $r$ is the radius and $h$ is the height.

Given that the volume is $147\pi$ cubic centimeters and the radius is $7$ cm, we substitute these values into the formula:

$$
147\pi = \frac{1}{3} \pi (7)^2 h.
$$

This is the correct expression to use to find $h$.

To further verify, if we solve for $h$, we would multiply both sides by $3$ and then divide by $\pi(7)^2$:

$$
h = \frac{147\pi \cdot 3}{\pi (7)^2}.
$$

Simplifying shows that $h$ comes out to be $9$ cm.

Thus, the expression that can be used to find the height is:

$$
147\pi = \frac{1}{3} \pi (7^2) h.
$$

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