Answer:
volume = 202.5 cubic meters
Step-by-step explanation:
We need to find volume of square pyramid, given 7.5m as the height and base of 9m each side (square base).
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We can use the formula to find volume of square pyramid. The formula is:

Where
x is the base (here it is 9 meters)
h is the height (which is given as 7.5 meters)
We substitute and find the volume:

The volume = 202.5 cubic meters