To find the volume of a rectangular pyramid, you can use the formula:
\[ V = \frac{1}{3} \times \text{Base Area} \times \text{Height} \]
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Calculate the base area of the pyramid: \[ \text{Base Area} = \text{length} \times \text{width} = 15 , \text{m} \times 20 , \text{m} = 300 , \text{m}^2 \]
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Now use the volume formula: \[ V = \frac{1}{3} \times 300 , \text{m}^2 \times 80 , \text{m} \] \[ V = \frac{1}{3} \times 24000 , \text{m}^3 \] \[ V = 8000 , \text{m}^3 \]
The volume of the tower is 8000 m³.
So the best answer is: 8,000 m³.