Answer:
V = 306.9 m³
Explanation:
The formula of a volume of a prism:

B - base area
H - height
In the base we have the right triangle.
The formula of an area of a righ triangle

a, b - legs
We have a = 6.2m and b = 11m. Substitute:

The height H = 9 m.
Substitute to the formula of a volume:
