正方形是一种特殊的平行四边形,它既具有矩形的一切性质,又具有菱形的一切性质,因此巧妙构造正方形,借助正方形的特殊性质,往往能够迅速找到解题途径,直观易懂,简捷明快.这样不仅能使问题化难为易,迎刃而解,而且有助于创新思维的培养.现略举几例加以说明. The square is a kind of special parallelogram. It has all the properties of the rectangle and all the properties of the diamond. Therefore, the square is constructed skillfully. With the help of the special nature of the square, the solution to problems can often be quickly found, which is intuitive and easy to understand. This will not only make problem-solving difficult and easy to solve, but also contribute to the cultivation of innovative thinking. Here are a few examples to illustrate.