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人教版《义务教育教科书·数学》八年级下册第17章是“勾股定理”.勾股定理是初等几何的一个重要定理,有广泛的应用.本章主要介绍了勾股定理及其逆定理,并介绍这两个定理的一些初步的应用,另外,结合这两个定理,介绍了逆命题和逆定理的有关知识.1本章内容概述直角三角形是一种极常见而特殊的三角形,它有许多性质,如两个锐角互余,30°的角所对的直角边等于斜边的一半.本章所研究的勾股定理,是直角三角形的非常重要的性质,有极其广泛的应用.平角的一半就是直角,空间中一条水平方向的直线和另
PEP is an important theorem of elementary geometry, has a wide range of applications.This chapter mainly introduces the Pythagorean Theorem and the “Pythagorean Theorem” Its inverse theorem and introduces some preliminary applications of these two theorems.In addition, combining these two theorems, introduces the relevant knowledge of the inverse proposition and the inverse theorem.1 The content of this chapter Overview Right triangle is a very common and special triangle , Which has many properties, for example, two acute angles and the right angle equal to 30 °, which is equal to half of the hypotenuse. The Pythagorean theorem studied in this chapter is a very important property of right triangle and has a very wide range of applications Half of the fillet is a right angle, a straight horizontal line in the space, and another