Please double check my answer. It's for a very important mark.
Calculate the volume of the triangle prism forming the roof in m3.
The height of the triangle is 1.5. Length is 8 meters. The base is 6 meters.
My answer is 4 meters. It that correct?
Calculate the volume of the triangle prism forming the roof in m3.
The height of the triangle is 1.5. Length is 8 meters. The base is 6 meters.
My answer is 4 meters. It that correct?

Your notation is very confusing. I think you mean the height of the triangle at the base is 1.5 meters, and its length is 6 meters, so the area of the base triangle is 1/2*1.5*6 = 4.5 square meters. If the length of the prism from top to bottom is 8 meters, the overall volume is then 8*4.5 = 36 m^3.
It turns out that the formula for the volume of a triangular prism with base triangle length L, base triangle height B, and length from top to bottom H is just
1/2*BLH,
so even if I've misinterpreted which one you meant should go where, the answer will come out the same regardless.
It turns out that the formula for the volume of a triangular prism with base triangle length L, base triangle height B, and length from top to bottom H is just
1/2*BLH,
so even if I've misinterpreted which one you meant should go where, the answer will come out the same regardless.

Not clear. Pls provide more info