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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,6,课时全等三角形的判定与性质,期末提分练案,沪科版八年级上,提示,:,点击 进入习题,答案显示,1,2,3,4,C,5,C,6,7,8,9,D,D,10,A,D,B,C,A,4,或,5,11,答案显示,12,225,13,见习题,14,15,见习题,16,见习题,17,见习题,132,18,见习题,19,见习题,1,如图是一种测量工具,点,O,是两根钢条,AC,,,BD,的中点,,AC,,,BD,能绕点,O,转动由三角形全等可得内槽宽,AB,与,CD,相等,其中,OABOCD,的依据是,(,),A,SSSB,ASA,C,SASD,AAS,C,2,如图,,ABD,CDB,,下面四个结论中,不正确的是,(,),A,ABD,和,CDB,的面积相等,B,ABD,和,CDB,的周长相等,C,A,ABD,C,CBD,D,AD,BC,,且,AD,BC,C,3,【2021,滁州定远月考,】,如图,点,A,,,D,,,C,,,E,在同一条直线上,,ABEF,,,AB,EF,,,B,F,,,AE,10,,,AC,6,,则,CD,的长为,(,),A,2B,4,C,4.5D,3,A,4,如图,,ABCABC,,点,B,在边,AB,上,线段,AB,与,AC,交于点,D,,若,A,40,,,B,60,,则,ACB,的度数为,(,),A,100B,120,C,135D,140,D,5,【2021,芜湖期末,】,芜湖长江三桥是集客运专线、市域轨道交通、城市主干道路于一体的公铁合建桥梁,,2020,年,9,月,29,日公路段投入运营,其侧面示意图如图所示,其中,ABCD,,现添加以下条件,不能判定,ABCABD,的是,(,),A,ACB,ADB,B,AB,BD,C,AC,AD,D,CAB,DAB,B,6,【,芜湖弋江区校级期末,】,已知,ABCABC,,等腰三角形,ABC,的周长为,18cm,,,BC,8cm,,那么,ABC,中一定有一条底边的长等于,(,),A,5cmB,2cm,或,5cm,C,8cmD,2cm,或,8cm,D,7,【2021,淮南月考,】,如图,在方格纸中,以,AB,为一边作,ABP,,使之与,ABC,全等,从,P1,,,P2,,,P3,,,P4,四个点中找出符合条件的点,P,,则点,P,有,(,),A,1,个,B,2,个,C,3,个,D,4,个,C,8,【,亳州涡阳期末,】,如图,在,ABC,中,,ADBC,于,D,,,BEAC,于,E,,,AD,交,BE,于点,F,,若,BF,AC,,则,ABC,等于,(,),A,45B,48,C,50D,60,A,9,【,安庆大观区期末,】,如图,在四边形,ABCD,中,,AC,平分,BAD,,,AD,AC,,在,AC,上截取,AE,AB,,连接,DE,,,BE,,并延长,BE,交,CD,于点,F,,以下结论:,BACEAD,;,ABE,ADE,BCD,;,BC,CF,DE,EF.,其中正确的有,(,),A,0,个,B,1,个,C,2,个,D,3,个,【点拨】,AC,平分,BAD,,,BAC,EAD,.,AB,AE,,,BAC,EAD,,,AC,AD,,,BAC,EAD,(,SAS,),,故,正确,ACB,ADE,,,BC,DE,.,AB,AE,,,AC,AD,,,ABE,AEB,,,ACD,ADC,,,BAE,2,ABE,180,,,CAD,2,ACD,180.,BAE,CAD,,,ABE,ACD,.,【,答案,】D,又,ACB,ADE,,,ABE,ADE,ACD,ACB,BCD,,故,正确,CEF,AEB,,,ABE,ACD,,,FEC,ECF,,,EF,CF,.,又,BC,DE,,,BC,CF,DE,EF,,故,正确故选,D.,10,一个三角形的三条边的长分别是,3,,,5,,,7,,另一个三角形的三条边的长分别是,3,,,3,x,2,y,,,x,2,y,,若这两个三角形全等,则,x,y,的值是,_,4,或,5,11,【宣城校级期末】如图,,AC,BC,,,DC,EC,,,ACB,ECD,90,,且,EBD,42,,则,AEB,_,【点拨】,ACB,ECD,90,,,BCD,ACE,.,在,BDC,和,AEC,中,,BDC,AEC,(,SAS,),,,DBC,EAC,.,EBD,DBC,EBC,42,,,EAC,EBC,42,,,ABE,EAB,180,90,42,48,,,AEB,180,(,ABE,EAB,),180,48,132.,【,答案,】132,12,【黄山校级期末】如图,在,33,的正方形网格中,,1,2,3,4,5,等于,_,【点拨】,如图,在,ABC,和,AEF,中,,ABC,AEF,(,SAS,),,,BCA,5,,,1,5,1,BCA,90.,在,ABD,和,AEH,中,,ABD,AEH,(,SAS,),,,BDA,4,,,2,4,2,BDA,90.,3,45,,,1,2,3,4,5,90,90,45,225.,【,答案,】225,13,如图,点,A,,,C,,,D,,,E,在,Rt,MON,的边上,,MON,90,,,AE,AB,且,AE,AB,,,BC,CD,且,BC,CD,,,BH,ON,于点,H,,,DF,ON,于点,F,,若,OE,a,,,BH,b,,,DF,c,,则图中阴影部分的面积为,_,(,用含,a,,,b,,,c,的代数式表示,),【点拨】,EAO,BAH,90,,,EAO,AEO,90,,,BAH,AEO,.,在,AEO,和,BAH,中,,AEO,BAH,(,AAS,),同理,BCH,CDF,(,AAS,),AO,BH,b,,,AH,EO,a,,,CH,DF,c,,,BH,CF,b,.,14,【,滁州来安期末,】,雨伞的中截面如图所示,伞骨,AB,AC,,支撑杆,OE,OF,,,AE,AB,,,AF,AC,,当,O,沿,AD,滑动时,雨伞开闭,问雨伞开闭过程中,,BAD,与,CAD,有何关系?说明理由,解:雨伞开闭过程中,BAD,CAD,.,理由如下:,AB,AC,,,AE,AB,,,AF,AC,,,AE,AF,.,在,AOE,和,AOF,中,,AOE,AOF,(,SSS,),,,BAD,CAD,.,15,如图,已知,AB,DC,,,AE,DF,,,CE,BF,.,求证:,AF,DE,.,16,【,2021,马鞍山期中】如图,,ABC,中,,E,,,F,分别在,AB,,,AC,上,,DE,DF,,,D,是,BC,的中点,试比较,BE,CF,与,EF,的大小,解:如图,延长,FD,至,M,,使,DM,DF,,连接,BM,,,EM,,,ED,DF,,,DM,DF,,,ED,垂直平分,MF,,,EF,EM,.,D,为,BC,的中点,,BD,DC,.,在,BMD,与,CFD,中,,BMD,CFD,(,SAS,),,,BM,FC,,,BE,BM,EM,,,BE,CF,EF,.,17,【,2021,滁州明光期末】,(1),如图,,,MAN,90,,射线,AE,在这个角的内部,点,B,,,C,在,MAN,的边,AM,,,AN,上,且,AB,AC,,,CF,AE,于点,F,,,BD,AE,于点,D,.,求证:,ABD,CAF,;,证明:,BD,AE,,,CF,AE,,,ADB,CFA,90,,,FAC,ACF,90,,,MAN,90,,,BAD,FAC,90,,,BAD,ACF,.,在,ABD,与,CAF,中,,ABD,CAF,.,(2),如图,,点,B,,,C,在,MAN,的边,AM,,,AN,上,点,E,,,F,在,MAN,内部射线,AD,上,,1,,,2,分别是,ABE,,,CAF,的外角,已知,AB,AC,,,1,2,BAC,,求证:,ABE,CAF,;,证明:,1,2,,,AEB,CFA,,,1,ABE,EAB,,,BAC,EAB,CAF,,,1,BAC,,,ABE,CAF,.,在,ABE,与,CAF,中,,ABE,CAF,.,(3),如图,,在,ABC,中,,AB,AC,,,AB,BC,,点,D,在边,BC,上,,CD,2,BD,,点,E,,,F,在线段,AD,上,,1,2,BAC,,若,ABC,的面积是,15,,则,ACF,与,BDE,的面积之和是,_,【,答案,】,5,【点拨】,ABC,的面积为,15,,,CD,2,BD,,,ABD,的面积为,15,5,,,易得,ABE,CAF,,,ACF,与,BDE,的面积之和,ABD,的面积,5.,18,【合肥肥西期末】已知:,ABC,EDC,.,(1),若,DE,BC,(,如图,),,判断,ABC,的形状并说明理由,解:,ABC,是等腰三角形,理由如下:,ABC,EDC,,,ABC,EDC,.,DE,BC,,,EDC,ACB,,,ABC,ACB,,,AB,AC,,,ABC,是等腰三角形,(2),连接,BE,交,AC,于,F,,点,H,是,CE,上的点,且,CH,CF,,连接,DH,交,BE,于,K,(,如图,),求证:,DKF,ACB,.,证明:,ABC,EDC,,,BC,CD,,,ACB,DCE,.,在,BCF,和,DCH,中,,BCF,DCH,,,FBC,HDC,.,在,FBC,和,FDK,中,,FBC,HDC,,,BFC,DFK,,,DKF,ACB,.,19,【,2021,合肥期末】如图,在,Rt,ABC,中,,AC,BC,,,C,90,,,O,为,AB,的中点,,M,,,N,分别是,AC,,,CB,(,或它们的延长线,),上的动点,且,AM,CN,.,(1),当,OM,AC,时,如图,,线段,OM,和线段,ON,的关系是,_,;,OM,ON,,,OM,ON,(2),当,OM,与,AC,不垂直时,如图,,,(1),中的结论还成立吗?若成立,请证明;若不成立,请说明理由;,解:成立,证明:如图,连接,OC,.,AC,BC,,,ACB,90,,,A,B,45,,,AC,BC,,,O,是,AB,的中点,,CO,AB,,,ACO,BCO,45.,A,NCO,.,易得,OA,OC,.,AM,CN,,,AMO,CNO,(,SAS,),,,OM,ON,,,AOM,CON,.,CO,AB,,,AOM,COM,90,,,CON,COM,90,,,OM,ON,.,(3),当,M,,,N,运动到,AC,,,CB,的延长线上时,如图,,请直接写出,S,ABC,,,S,OMN,,,S,CMN,之间的关系,【点拨】,连接,CO,,如图所示易得,OCM,OBN,,,S,OMN,S,五边形,OBNMC,S,CMN,S,OCB,S,CMN,S,ABC,.,
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