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两千三百年前,欧几里得曾在《几何原本》第2卷中写过命题11。这个命题表明:可以把一条已知线段划分为两部分,使得长为整个线段、宽为两部分中的较短线段的矩形的面积,等于以另一部分线段为边的正方
Two thousand and three hundred years ago, Euclid had written Proposition 11 in Volume 2 of The Geometry Books. This proposition shows that a known line segment can be divided into two parts, so that the area of a rectangle that is the entire line segment and is a shorter line segment in two parts is equal to the square with the other line segment as an edge.