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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,第七章 平面图形及其位置关系,3,3,4,3=,1=52,4=,(,180,-,3,),2=64,1,2,2=,1,2=,AOB,=37,36,DEB=,1+,AOB,=2,AOB,4,3,1,AOF=,1+,F,=,A+,F,内错角相等,两直线平行;,相等的两个角是对顶角;,有两个角相等的三角形是等腰三角形;,对角线互相垂直的四边形是菱形。,50,40,F,3,2-1=,3,-1,=,ABF=180,-,ABC,AFC=,E+EAF,=,E+B,1,2,1=,ABC=26,1=,2=26,E,过点,D,作,DE,AB,,垂足为,E,BD,是,ABC,平分线,DC=DE,A=30,AB=2BC,M,过点,E,作,EM/AB,则,MEB+,ABE=180,AB/CD,,,EM/AB,EM/CD,MED+,CD,E=180,MEB+,ABE+,MED+,CDE=180,+,180,即,ABE+,B,ED+,CDE=360,BED=61,ABE+,CDE=299,ABE,的平分线与,CDE,的平分线交于点,F,FBE+,FDE=,(,ABE+,CDE,),2,=149.5,DFB=360,-,(,FBE+,FDE,),-,BED,D,E,
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