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梯形,可分割成三角形,可改成平行四边形。还可改成多边形.因此它是一个“桥梁”图形.本文介绍梯形的一个面积天系,并用它破解几个难题.
Trapezoidal, can be divided into triangles, can be changed into a parallelogram. It can also be turned into a polygon. So it is a “bridge” graphic. This article describes an area of trapezoidal sky and uses it to solve several puzzles.