To find the volume of a rectangular pyramid, you can use the formula:
\[ \text{Volume} = \frac{1}{3} \times \text{Base Area} \times \text{Height} \]
First, calculate the base area:
\[ \text{Base Area} = \text{Length} \times \text{Width} = 15 , \text{m} \times 20 , \text{m} = 300 , \text{m}^2 \]
Now, we can substitute the base area and the height (80 m) into the volume formula:
\[ \text{Volume} = \frac{1}{3} \times 300 , \text{m}^2 \times 80 , \text{m} \]
Calculate the volume:
\[ \text{Volume} = \frac{1}{3} \times 24000 , \text{m}^3 = 8000 , \text{m}^3 \]
Thus, the volume of the tower is:
8,000 m³