Volume = 1/2*(a+b)*h*l
where
a and b are the lengths of the parallel sides of the trapezium,
h is the height of the trapezium, and
l is the length of the prism.
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If you mean volume of a trapezoidal prism then it is: 0.5*(sum of parallel sides)*height*length
the volume of a trapezoidal prism is equal to the height times the base area of the trapezoid. First you find the area of trapezoid h(a+b)/2 h is the height of the trapezoid, not the height of the prism a is the length of the top b is the length of the bottom Then you find the volume of the trapezoidal prism with this formula H*h(a+b)/2 H is the height of the prism. Multiply H by the area of the trapezoid that you found in step one.
The volume of a rectangular prism can be found by the formula: volume=length*width*height
Volume = (length) times (width) x (height)
V = l × w × h