Answer:
102.5 m³
Explanation:
V = (1/3)Bh
where B = area of the base, and h = height of the pyramid
The base is a square. Its perimeter is 15.2 m.
For a square, the perimeter is 4 times the side.
side = 15.2 m / 4 = 3.8 m
V = (1/3)(3.8 m)²(21.3 m)
V = 102.5 m³