Which is correct calculation for the volume of the prism

If its a triangular prism then you use the equation V = ½ * length * width * height, or V = the area of the base * the height. After that you find the area of the base by multiplying ½ * the length and width of one of the triangular bases of the prism. Then, locate the height, and multiply the height by the area of the base ... But I don't know if this is what you were asking, so just in case

The volume is calculated with base times height