八年级数学上(北师版)1-8单元尖子生拔高试题精选(共10套含期中和期末...(国外英文资料).docVIP

八年级数学上(北师版)1-8单元尖子生拔高试题精选(共10套含期中和期末...(国外英文资料) This article is contributed by chenhuanyieric DOC documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. To serve students, we are more professional! Junior high school weekend, grade mathematics, junior high school weekend, grade eight math The Pythagorean theorem The content of the content . This chapter focuses on the Pythagorean theorem, and prove that the application of the Pythagorean theorem and how to use the Pythagorean theorem to determine the triangle is a right triangle. Based on the Pythagorean theorem, also introduced the method of three-dimensional graphics along the surface distance. Knowledge and knowledge overview of compliance requirements overview and compliance requirements through the study of this chapter, able to skillfully use the Pythagorean theorem to solve the relationship between the three side of a right triangle: a + B = C where a and B are right angle side, regardless of size, the C is the hypotenuse. Note that this formula can be applied only in a right triangle, the triangle in a + B C, an obtuse triangle 222222 A 2B 2 C 2. Inverse theorem three edge to meet the a 2 + B 2 = C 2 triangle is a right triangle Google theorem, in which such a group of a, B, C called the Pythagorean number, Remember some of the commonly used Pythagorean number: 3,4,5; 5,12,13; 8,15,17; 7,24,25; 9,40,41; and their integer. For the distance between two points using the general development, combined with the Pythagorean theorem to solve. Example Jingjiang example Jingjiang at the bottom of the cuboid A point is an ant, it wants to eat the food on the bottom surface of the B (BC=3cm), such as the 1 figure is a cuboid box (size as shown), how much is the shortest way to crawl? B C 16cm 12cm A 9cm With classroom training exercise training 2 as shown in the figure, there is a cylindrical shape building, bottom diameter of