#### Sentence Examples

• If R and S are the ends of a prismoid, A and B their areas, h the perpendicular distance between them, and C the area of a section by a plane parallel to R and S and midway between them, the volume of the prismoid is *h(A+4C+B).
• The most instructive is to regard the prismoid as built up (by addition or subtraction) of simpler figures, which are particular cases of it.
• (iv) For the prismoid in general let ABCD ...
• By (i) and (iii), the formula holds for each of these figures; and therefore it holds for the prismoid as a whole.
• Another method of verifying the formula is to take a point Q in the mid-section, and divide up the prismoid into two pyramids with vertex Q and bases ABCD ...