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Surface Area = 2 × Base Area + Base Perimeter × Length
The first is a two dimensional concept, the second is 3-dimensional.
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.
It is the area of the trapezoidal face multiplied by the length of the prism.
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