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由于实际生活的需要,在很早的时候人們就需要认識各种形状的体积,就需要对各种形状的体积进行計算。例如:兴修水利就需要計算水渠的容积和堤堰的体积;为了发展都市和防御敌人进攻,就需要筑城,就需要知道筑城时所需土方或石方的体积;为了貯藏粮谷,就需要知道各种形状的倉库的容积,例如方窖、圓窖……等粮倉的容积。在我国古代,关于体积的各种知識,关于計算各种形状体积时所应用的公式,也正是由于上述这些生活中的实际需要而产生的。
Due to the needs of real life, people need to understand the volume of various shapes at an early time, and it is necessary to calculate the volume of various shapes. For example, to build water conservancy, it is necessary to calculate the volume of the canal and the volume of the dike. To develop the city and defend against enemy attacks, you need to build a city. You need to know the volume of the earth or stone that you need to build a city. To store grains, you need to know each The volume of a kind of warehouse, such as a square cellar, a round cellar, etc., is the volume of a granary. In ancient China, all kinds of knowledge about volume, and the formulas used when calculating the volume of various shapes, are precisely due to the actual needs of these above-mentioned lives.