Answer with Step-by-step explanation:
We know that:
volume of a triangular prism = Base area × height of prism
We are given:
Base of triangle = 5 ft
Height of triangle = 3 ft
Height of prism = 7.5 ft
Base Area=

=7.5 ft²
Volume of triangular prism =7.5 × 7.5
= 56.25 ft³
Hence, Volume of triangular prism is:
56.25 cubic feet