勾股定理是初中几何的一个重要定理,它主要是用于求直角三角形的边长;而其逆定理则是用于判定一个三角形中的某一个角是直角.由此看来,勾股定理与其逆定理在应用上有着很大的不同,然而却有不少的几何问题必须非要应用两者“联手”来解决不可,现略举几例说明.一、先用勾股定理再 The Pythagorean theorem is an important theorem of the geometry of junior high school. It is mainly used to find the side length of a right-angled triangle. The inverse theorem is used to determine whether a certain angle in a triangle is a right angle. From this point of view, the Pythagorean theorem There is a big difference in its application of the inverse theorem. However, there are quite a few geometric problems that must be solved by applying the two “joint hands”. Now, here are a few examples. First, use the Pythagorean Theorem