Respuesta :

colevv

Answer:

514.5 ft.³

Step-by-step explanation:

Volume of a triangular prism

= base area × height

In the figure, the base is a right-angled triangle.

The base area

= (7×7)÷2

= 24.5 ft²

The volume of the prism

= 24.5×21

= 514.5 ft³