prismoidal formula

prismoidal formula

[priz¦mȯid·əl ′fȯr·myə·lə] (mathematics) A formula that gives the volume of a prismatoid as (1/6) h (A1+ 4 Am + A2), where h is the altitude, A1 and A2 are the areas of the bases, and Am is the area of a plane section halfway between the bases.