最新初中数学几何知识点归纳优秀名师资料
初中数学几何知识点归纳中考几何知识点归纳 角与(平行)线 1 过两点有且只有一条直线 2 两点之间线段最短 3 同角或等角的补角相等 4 同角或等角的余角相等 5 过一点有且只有一条直线和已知直线垂直 6 直线外一点与直线上各点连接的所有线段中，垂线段最短 7 平行公理 经过直线外一点，有且只有一条直线与这条直线平行 8 如果两条直线都和第三条直线平行，这两条直线也互相平行 9 同位角相等，两直线平行 10 内错角相等，两直线平行 11 同旁内角互补，两直线平行 12 两直线平行，同位角相等 13 两直线平行，内错角相等 14 两直线平行，同旁内角互补 the drawings, first to become familiar with the drawings, mainly about the following aspects: 1) pages of drawings and diagrams, maps; 2) a comprehensive understanding of drawing; 3) finding of design-driven dimensions (), do not resize and adjust the size; 4) questioned the drawings; 5) develop buries a construction programme and technical clarification; 6) clear corners and special treatment; 7) controlled construction drawings to verify construction scheme and design. (2) at the construction site to find subject planted area: various engineering, first on the scene to find planted area, it must first understand the curtain wall installation section, and some projects are all curtain wall, the entire project is a region-wide, only partial walls, the zone is local. (3) identify the axis positioning: positioning the drawings shown in axis compared with the actual construction site to find out exactly where the axis positioning, axis positioning function are: 1) to help determine the origin of curtain walls; 2) acceptance of the installation is accurate; 3) adjust errors, and determine the error range. (4) find anchor points: according to site to find the exact location of the axis, according to the drawings provided by the content determine the positioning point; number of anchor points shall not be less than two points. Repeated measurements determine the location points must ensure that the positioning is correct. (5) take level (level): level (minor works available in horizontal pipe), the two anchor points determine the horizontal position. Level according to use 三角形的边与角 15 定理 三角形两边的和大于第三边 16 推论 三角形两边的差小于第三边 17 三角形内角和定理 三角形三个内角的和等于180? 18 推论1 直角三角形的两个锐角互余 19 推论2 三角形的一个外角等于和它不相邻的两个内角的和 20 推论3 三角形的一个外角大于任何一个和它不相邻的内角 全等三角形 21 全等三角形的对应边、对应角相等 22 边角边公理(SAS) 有两边和它们的夹角对应相等的两个三角形全等 23 角边角公理( ASA)有两角和它们的夹边对应相等的两个三角形全等 24 推论(AAS) 有两角和其中一角的对边对应相等的两个三角形全等 25 边边边公理(SSS) 有三边对应相等的两个三角形全等 26 斜边、直角边公理(HL) 有斜边和一条直角边对应相等的两个直角三角形全等 the drawings, first to become familiar with the drawings, mainly about the following aspects: 1) pages of drawings and diagrams, maps; 2) a comprehensive understanding of drawing; 3) finding of design-driven dimensions (), do not resize and adjust the size; 4) questioned the drawings; 5) develop buries a construction programme and technical clarification; 6) clear corners and special treatment; 7) controlled construction drawings to verify construction scheme and design. (2) at the construction site to find subject planted area: various engineering, first on the scene to find planted area, it must first understand the curtain wall installation section, and some projects are all curtain wall, the entire project is a region-wide, only partial walls, the zone is local. (3) identify the axis positioning: positioning the drawings shown in axis compared with the actual construction site to find out exactly where the axis positioning, axis positioning function are: 1) to help determine the origin of curtain walls; 2) acceptance of the installation is accurate; 3) adjust errors, and determine the error range. (4) find anchor points: according to site to find the exact location of the axis, according to the drawings provided by the content determine the positioning point; number of anchor points shall not be less than two points. Repeated measurements determine the location points must ensure that the positioning is correct. (5) take level (level): level (minor works available in horizontal pipe), the two anchor points determine the horizontal position. Level according to use 角平分线 27 定理1 在角的平分线上的点到这个角的两边的距离相等 28 定理2 到一个角的两边的距离相同的点，在这个角的平分线上 *29 角的平分线是到角的两边距离相等的所有点的集合 等腰三角形与等边三角形 30 等腰三角形的性质定理 等腰三角形的两个底角相等 (即等边对等角) 31 推论1 等腰三角形顶角的平分线平分底边并且垂直于底边 32 等腰三角形的顶角平分线、底边上的中线和底边上的高互相重合 33 推论3 等边三角形的各角都相等，并且每一个角都等于60? 34 等腰三角形的判定定理 如果一个三角形有两个角相等，那么这两个角所对的边也相等(等角对等边) 35 推论1 三个角都相等的三角形是等边三角形 36 推论 2 有一个角等于60?的等腰三角形是等边三角形 the drawings, first to become familiar with the drawings, mainly about the following aspects: 1) pages of drawings and diagrams, maps; 2) a comprehensive understanding of drawing; 3) finding of design-driven dimensions (), do not resize and adjust the size; 4) questioned the drawings; 5) develop buries a construction programme and technical clarification; 6) clear corners and special treatment; 7) controlled construction drawings to verify construction scheme and design. (2) at the construction site to find subject planted area: various engineering, first on the scene to find planted area, it must first understand the curtain wall installation section, and some projects are all curtain wall, the entire project is a region-wide, only partial walls, the zone is
