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If it is a rectangular trapezoidal pedestal: Calculate the area of the base of the pedestal, multiply by the height of the pedestal.

If the angles of the pedestal are not 90deg.. i.e. if it is a pyramidal trapezoidal pedestal.

Then calculate the volume as you normally would a rectangular trapezoidal pedestal, and subtract the volume of the missing triangular pieces with the formula 1/3 area of base X height.

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Q: How do you find the volume of a trapezoidal pedestal?
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