由于建筑工地上砂、石堆的外形很象棱台,在计算砂、石堆体积时,许多人以为采用棱台体积的计算公式,即V=h/3×(S_1+S+(S_1S)~(1/2)计算即可,其实不对。砂、石堆并不是棱台。棱台各个侧棱的延长线必交于一点,计算棱台的体积公式也是因此而得到的。而工地的砂、石堆都是随便堆放的,其侧棱的延长线很难准确地交于一点,只能保证上、下底面是平行的,这样的形体叫拟柱体。图1所示的是拟柱体。图2所示的是棱台。 Due to the fact that the sand and stone stacks on the construction site are shaped like a prism, when calculating the volume of sand and stone piles, many people think that the calculation formula for the volume of the edge table is V=h/3×(S_1+S+(S_1S)~ (1/2) Calculation is not correct, in fact, sand and stone stacks are not edged tables, and the extension lines of each side edge of the prism table must be intersected at one point, and the formula for calculating the volume of the prism table is also obtained. Stone piles are piled up casually, and the extensions of the side ribs are difficult to accurately intersect at one point, and only the top and bottom surfaces are parallel. This type of body is called a quasi-column. Figure 1 shows the quasi-column. Figure 2 shows a prism table.