High School

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

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

Answer :

The formula for the volume of a cone is given by

[tex]$$
V = \frac{1}{3}\pi r^2 h.
$$[/tex]

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

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

Here is the step-by-step breakdown:

1. Start with the volume formula for a cone:

[tex]$$
V = \frac{1}{3}\pi r^2 h.
$$[/tex]

2. Substitute [tex]$r = 7$[/tex] cm into the formula:

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

3. Since the volume [tex]$V$[/tex] is given as [tex]$147\pi$[/tex], the equation becomes:

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

This is the expression that can be used to find [tex]$h$[/tex], the height of the cone.

Thus, the correct expression is

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

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