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,*,*,第十二章,全等 三角形,12.2 三角形全等的判定,12.2.3 三角形全等的判定ASA、SSA,1,1,2,3,4,5,6,7,8,9,10,2,1,如图,玻璃三角板摔成三块,现在到玻璃店再配一块同样大小的三角板,最省事的方法,(,),A,带,去,B,带,去,C,带,去,D,带,去,返回,C,3,2如图,12,那么不一定能使ABDACD的条件是(),AABAC BBDCD,CBC DBDACDA,B,返回,4,3如图,ABC的六个元素,那么以下甲、乙、丙三个三角形中和ABC全等的图形是(),A甲乙 B甲丙 C乙丙 D乙,C,返回,5,4如图,A D,OAOD,DOC60,那么DBC_,30,返回,6,5,如图,,BD,AC,于点,D,,,CE,AB,于点,E,,,AD,AE,.,求证:,BE,CD,.,证明:,BD,AC,于点,D,,,CE,AB,于点,E,,,ADB,AEC,90,,,在,ADB,和,AEC,中,,ADB,AEC,(ASA),,,AB,AC,,,又,AD,AE,,,BE,CD,.,返回,7,6(中考泸州)如图,点A,F,C,D在同一条直线上,AFDC,AD,BCEF.求证:ABDE.,证明:,AF,CD,,,AC,DF,,,BC,EF,,,ACB,DFE,,,在,ABC,和,DEF,中,,ABC,DEF,(ASA),,,AB,DE,.,返回,8,7(中考春浦东新区期末):如图,OAOB,OCOD,AOBBOCCOD,线段AC交线段OB于点M,线段BD交线段OC于点N.,(1)请说明AOCBOD的理由;,解:,(1),AOB,BOC,COD,,,AOC,BOD,,,在,AOC,与,BOD,中,,AOC,BOD,;,9,(2),请说明,OM,ON,的理由,AOC,BOD,,,A,B,,,在,AOM,与,BON,中,,AOM,BON,,,OM,ON,.,返回,10,8,如图,,ABN,和,ACM,中,,AB,AC,,,AD,AE,,,1,2.,求证:,(1),BD,CE,;,证明:,(1),在,ABD,和,ACE,中,,ABD,ACE,(SAS),,,BD,CE,;,11,(2),M,N,.,1,2,,,1,DAE,2,DAE,,,即,BAN,CAM,,,由,(1),得,ABD,ACE,,,B,C,,,在,ACM,和,ABN,中,,ACM,ABN,(,ASA,),,,M,N,.,返回,12,9,如图,四边形,ABCD,中,,E,点在,AD,上,其中,BAE,BCE,ACD,90,,且,BC,CE,.,求证:,ABC,DEC,.,13,证明:,BCE,ACD,90,,,3,4,4,5,,,3,5,,,在,ACD,中,,ACD,90,,,2,D,90,,,BAE,1,2,90,,,1,D,,,在,ABC,和,DEC,中,,ABC,DEC,(AAS),返回,14,10,(,中考,苏州,),如图,,A,B,,,AE,BE,,点,D,在,AC,边上,,1,2,,,AE,和,BD,相交于点,O,.,(1),求证:,AEC,BED,;,15,(1),证明:,AE,和,BD,相交于点,O,,,AOD,BOE,.,在,AOD,和,BOE,中,,A,B,,,BEO,2.,又,1,2,,,1,BEO,,,AEC,BED,.,在,AEC,和,BED,中,,AEC,BED,(ASA),16,解:,AEC,BED,,,EC,ED,,,C,BDE,.,在,EDC,中,,EC,ED,,,1,42,,,C,EDC,69,,,BDE,C,69.,(2)假设142,求BDE的度数,返回,17,