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Formula for frustum of pyramid:

V =  \frac{h}{3} (A _{1} + A _{2} + \sqrt{A _{1}A _{2}  )

h = also altitude, the perpendicular distance between A1 (lower base) and 
           A2 (upper base)

 A_{1} =  lower base
 A_{2} = upper base
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