Find the volume, in cubic inches, of a cone with a radius of 11 inches and a height of 24 inches. Round your answer to the nearest hundredth.

A. 3,039.52 cu in
B. 828.96 cu in
C. 2,486.88 cu in
D. 9,118 cu in

1 answer

The volume \( V \) of a cone can be calculated using the formula:

\[ V = \frac{1}{3} \pi r^2 h \]

where \( r \) is the radius and \( h \) is the height.

Given:

  • \( r = 11 \) inches
  • \( h = 24 \) inches

Now substituting the values into the formula:

\[ V = \frac{1}{3} \pi (11^2) (24) \]

Calculating \( 11^2 \):

\[ 11^2 = 121 \]

Now substituting that back into the volume formula:

\[ V = \frac{1}{3} \pi (121) (24) \]

Calculating \( 121 \times 24 \):

\[ 121 \times 24 = 2904 \]

Now our formula for volume becomes:

\[ V = \frac{1}{3} \pi (2904) \]

Calculating \( \frac{2904}{3} \):

\[ \frac{2904}{3} = 968 \]

Now we multiply by \( \pi \):

\[ V = 968 \pi \]

Using the approximate value of \( \pi \approx 3.14159 \):

\[ V \approx 968 \times 3.14159 \]

Calculating the volume:

\[ V \approx 3042.74192 \]

Now rounding to the nearest hundredth:

\[ V \approx 3042.74 \text{ cu in} \]

Among the options provided, none of them match exactly. However, the closest option seems to be:

A. 3,039.52 cu in

So, the answer to the volume of the cone is approximately:

3042.74 cubic inches (closest choice A.).