Question

To find the volume of the cone in the picture where S = 13 cm and R = 5 cm:

A light pink cone is depicted. A dashed line represents the circular base of the cone. A line labeled "R" extends from the base to a point on the side of the cone, indicating the radius. A vertical line labeled "H" extends from the base to the apex of the cone, indicating the height. A slanting line labeled "S" extends from the apex to a point on the base, indicating the slant height. The lines R, H, and S form a right angle at the base of the cone.

(3 points)
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Answers

GPT-4o mini
To find the volume of the cone, we use the formula:

\[
V = \frac{1}{3} \pi R^2 H
\]

where:
- \( V \) is the volume,
- \( R \) is the radius of the base (5 cm),
- \( H \) is the height of the cone.

We are given:
- \( R = 5 \) cm
- The slant height \( S = 13 \) cm

First, we need to find the height \( H \) of the cone. We can use the Pythagorean theorem because the values of \( R \), \( H \), and \( S \) form a right triangle:

\[
S^2 = R^2 + H^2
\]

Substituting the known values:

\[
13^2 = 5^2 + H^2
\]
\[
169 = 25 + H^2
\]
\[
H^2 = 169 - 25
\]
\[
H^2 = 144
\]
\[
H = \sqrt{144} = 12 \, \text{cm}
\]

Now, substituting \( R \) and \( H \) back into the volume formula:

\[
V = \frac{1}{3} \pi (5)^2 (12)
\]
\[
V = \frac{1}{3} \pi (25)(12)
\]
\[
V = \frac{1}{3} \pi (300)
\]
\[
V = 100\pi
\]

Thus, the volume of the cone is:

\[
V \approx 314.16 \, \text{cm}^3 \quad (\text{using } \pi \approx 3.1416)
\]

In summary, the volume of the cone is \( 100\pi \, \text{cm}^3 \) or approximately \( 314.16 \, \text{cm}^3 \).

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