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2024湖南中考数学二轮专题复习含解析
展开依标扣本 掌握必备知识
聚焦中考 培育核心素养
通过平移、轴对称(折叠)、旋转等得到完全重合.
1.全等三角形的判定定理
1.“HL”只适用于直角三角形.2.“AAA”“SSA”不能判定三角形全等.如图1,△ABC与△A'B'C'的三个角都相等,但△ABC与△A'B'C'相似而不全等;如图2,在△ABC和△ABC'中,AB=AB,AC=AC',∠B=∠B,但△ABC与△ABC'不全等.3.证明三角形全等时,对应顶点的字母必须写在对应位置上,养成良好的书写习惯.
【链接教材】1.(人教八上P32练习T2改编)如图,AB,CD相交于点O,△OCA≌△OBD,AO=6,BO=4,则CD的长为 ( ) A. 9 B. 10 C. 11 D. 12
OD=OA=6,OC=OB=4
CD=OD+OC=6+4=10
【链接教材】2.(湘教八上P78练习T3改编)如图,已知AB=AC,BD=CE.求证:△ACD≌△ABE.
△ACD≌△ABE(SAS)
证明:∵AB=AC,BD=CE,∴AB-BD=AC-CE,即AD=AE.又∵AC=AB,∠A=∠A,∴△ACD≌△ABE(SAS).
【链接教材】3. (人教八上P41练习T2改编)如图,AD∥BC,AD=CB,求证:△ADE≌△CBE.
证明:∵AD∥BC,∴∠A=∠C,∠D=∠B.在△ADE和△CBE中, ∠D=∠B, AD=CB, ∠A=∠C,∴△ADE≌△CBE(ASA).
【链接教材】4. (湘教八上P88习题T8改编)如图,AB=AC,DB=DC,则直接由“SSS”可以判定 ( )A.△ABD≌△ACDB.△ABE≌△ACEC.△EBD≌△ECDD.以上答案都不对
【链接教材】5. (华师八上P70练习T1改编)已知∠B=∠C,∠BAD=∠CAD.求证:∠ADB=∠ADC.
证明:∵∠BAD=∠CAD,∠B=∠C,AD=AD,∴△ABD≌△ACD(AAS).∴∠ADB=∠ADC.
【链接教材】6.(华师八上P74例7改编)如图,∠C=∠D=90°,添加一个条件,可使用“HL”判定Rt△ABC≌Rt△ABD.添加的条件是:______________________.(写一个即可)
AC=AD(或BC=BD)
已有公共斜边AB,缺什么?
AC=AD或者BC=BD
【例1】(2023·长沙)如图,AB=AC,CD⊥AB,BE⊥AC,垂足分别为D,E.(1)求证:△ABE≌△ACD;(2)若AE=6,CD=8,求BD的长.
∠ADC=∠AEB=90°
△ABE≌△ACD(AAS)
AD=AE=6,CD=8
(1)证明:∵CD⊥AB,BE⊥AC,∴∠AEB=∠ADC=90°.
∴△ABE≌△ACD(AAS).
(2)解:∵△ABE≌△ACD,∴AD=AE=6.∵AB=AC=10,∴BD=AB-AD=10-6=4.
【变式】(2023·苏州)如图,在△ABC中,AB=AC,AD为△ABC的角平分线.以A为圆心,AD长为半径画弧,与AB,AC分别交于点E,F,连接DE,DF.
(1)求证:△ADE≌△ADF;
(2)若∠BAC=80°,求∠BDE的度数.
(1)证明:∵AD是△ABC的角平分线,∴∠BAD=∠CAD.由作图知AE=AF.∴△ADE≌△ADF(SAS).
1.(2023•长春)如图,工人师傅设计了一种测零件内径AB的卡钳,卡钳交叉点O为AA',BB' 的中点,只要量出A'B' 的长度,就可以知道该零件内径AB的长度.依据的数学基本事实是 ( )A.两边及其夹角分别相等的两个三角形全等B.两角及其夹边分别相等的两个三角形全等C.两条直线被一组平行线所截,所得的对应线段成比例D.两点之间线段最短
2.(2023·凉山州)如图,点E,点F在BC上,BE=CF,∠B=∠C,添加一个条件,不能证明△ABF≌△DCE的是 ( )A.∠A=∠DB.∠AFB=∠DECC.AB=DCD.AF=DE
3.(2023·重庆A)如图,在Rt△ABC中,∠BAC=90°,AB=AC,D为BC上一点,连接AD.过点B作BE⊥AD于点E,过点C作CF⊥AD交AD的延长线于点F.若BE=4,CF=1,则EF的长度为 .
4.(2022·益阳)如图,在Rt△ABC中,∠B=90°,CD∥AB,DE⊥AC于点E,且CE=AB.求证:△CED≌△ABC.证明:∵DE⊥AC,∠B=90°,∴∠DEC=∠B=90°.∵CD∥AB,∴∠A=∠DCE.∴△CED≌△ABC(ASA).
5. (2023·福建)如图,OA=OC,OB=OD,∠AOD=∠COB.求证:AB=CD.证明:∵∠AOD=∠COB,∴∠AOD-∠BOD=∠COB-∠BOD,即∠AOB=∠COD.在△AOB 和△COD中,∴△AOB≌△COD(SAS).∴AB=CD.
【例2】(2023•怀化)如图,矩形ABCD中,过对角线BD的中点O作BD的垂线EF,分别交AD,BC于点E,F.(1)证明:△BOF≌△DOE;(2)连接BE,DF,证明:四边形EBFD是菱形.
四边形BFDE是平行四边形
证明:(1)∵四边形ABCD是矩形,∴AD∥BC.∴∠EDO=∠FBO.∵O是BD的中点,∴DO=BO.又∵∠EOD=∠FOB,∴△BOF≌△DOE(ASA).
(2)由(1)知△BOF≌△DOE,∴BF=DE.∵四边形ABCD是矩形,∴AD∥BC,即DE∥BF.∴四边形EBFD是平行四边形.∵EF⊥BD,∴四边形EBFD是菱形.
6.如图,在四边形ABCD中,∠BAD=∠C=90°,AB=AD,AE⊥BC于点E,若线段AE=5,则S四边形ABCD=____.
7.(2023·遂宁)如图,四边形ABCD中,AD∥BC,O为对角线BD的中点,过点O的直线l分别与AD,BC所在的直线相交于点E,F.(点E不与点D重合)(1)求证:△DOE≌△BOF;证明:(1) ∵AD∥BC,∴∠ODE=∠OBF.∵O为对角线BD的中点,∴OD=OB.在△DOE和△BOF中,∴△DOE≌△BOF(ASA).
7.(2023·遂宁)如图,四边形ABCD中,AD∥BC,O为对角线BD的中点,过点O的直线l分别与AD,BC所在的直线相交于点E,F.(点E不与点D重合)(2)当直线l⊥BD时,连接BE,DF,试判断四边形EBFD的形状,并说明理由.
解:(2)四边形EBFD是菱形,理由如下:∵OD=OB,直线l经过点O且l⊥BD,∴直线l是线段BD的垂直平分线.∴DE=BE,DF=BF.∵△DOE≌△BOF,∴DE=BF.∴DE=BE=DF=BF.∴四边形EBFD是菱形.
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