Dahlia makes a square-based pyramid out of clay. It has a height of 6 inches and a base area of 36 square inches. Then, Dahlia makes a cube out of clay. The cube has the same height and the same base area as the pyramid. What is the volume of the pyramid in cubic inches if the volume of the cube is 216?

1 answer

To find the volume of the pyramid, we can use the formula for the volume of a pyramid:

\[ V = \frac{1}{3} \times \text{Base Area} \times \text{Height} \]

From the problem, we know:

  • The base area of the pyramid is \( 36 \) square inches.
  • The height of the pyramid is \( 6 \) inches.

Now, we can substitute these values into the volume formula:

\[ V = \frac{1}{3} \times 36 \times 6 \]

First, calculate \( 36 \times 6 \):

\[ 36 \times 6 = 216 \]

Now substitute this back into the volume formula:

\[ V = \frac{1}{3} \times 216 \]

Now divide \( 216 \) by \( 3 \):

\[ V = 72 \]

Thus, the volume of the pyramid is:

\[ \boxed{72} \text{ cubic inches} \]

To confirm consistency, let's also check the given information about the cube. The volume of a cube is given by \( V = \text{side}^3 \). We are given the volume of the cube as \( 216 \) cubic inches. To find the side length, we solve:

\[ \text{side}^3 = 216 \]

Taking the cube root, we get:

\[ \text{side} = \sqrt[3]{216} = 6 \]

With the side length being \( 6 \) inches, the height and base consideration fits in as well, confirming that both shapes share the same dimensions, with the pyramid having a volume of \( \boxed{72} \text{ cubic inches} \).