Volume of a triangular prism using 9ft, 8ft, and 11ft

The volume of triangular prisms: (Base * 1st height : 2) * 2nd height.

Plug the numbers into the formula: (9 * 8 : 2) * 11

And we get (72 : 2) * 11

36 * 11

= 396 ft³

Remember that the second height will be the longest measurement (my math teacher said so)