Prismatoid(redirected from prismatoidal)
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a polyhedron in which two faces (the bases of the prismatoid) lie in parallel planes and the remaining faces are
triangles or trapezoids, where one side of each triangle and two sides of each trapezoid are edges of the bases (see Figure 1). The volume of a prismatoid is equal to (h/6) (S + S′ + 4S″), where h is the perpendicular distance between the bases, S and S′ are the areas of the bases, and S″ is the area of a plane section midway between the two bases.