It is the area of the trapezoidal face multiplied by the length of the prism.
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It is not a prism, and there is no such thing as a prisam.
for example, a trapeziodal pyramid of ABCDEFGJ. With a height H . Volume is area of the base EFGJ which is half (a + b)h where h is the length between the two parallel lines. Therefore the volume is the area of the base times the heigth H
Yes.
is a sphere a prisam
An octagonal prism has 16 vertices.