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南京中考必考点③:三角形全等与相似

  • 2026-05-29 07:35:32
南京中考必考点③:三角形全等与相似

一、知识点概述

全等三角形和相似三角形是初中几何的两大核心工具,也是南京中考几何题的必考内容。全等用于证明线段相等、角相等,相似用于求线段比例、面积比。两者常常结合使用,是解决几何综合题的关键。

1. 全等三角形

• 判定定理:SSS、SAS、ASA、AAS、HL(直角三角形)

• 性质:对应边相等、对应角相等、周长相等、面积相等

• 常见模型:一线三等角、手拉手模型、倍长中线

2. 相似三角形

• 判定定理:AA(两角对应相等)、SAS(两边成比例且夹角相等)、SSS(三边成比例)

• 性质:对应边成比例、对应角相等、周长比=相似比、面积比=相似比的平方

• 常见模型:A字型、8字型、射影定理、母子型

二、经典考法盘点

考法一:全等三角形证明

基础题型,通常出现在解答题前几题。

典型例题:

如图,AB=AC,AD=AE,BAC=DAE。求证:BD=CE。

解题思路:

分析:要证BD=CE,考虑证BAD≌△CAE

证明:∵∠BAC=DAE

∴∠BAC-DAC=DAE-DAC,即BAD=CAE

BAD和CAE中:

AB=AC(已知)

BAD=CAE(已证)

AD=AE(已知)

∴△BAD≌△CAE(SAS)

BD=CE(全等三角形对应边相等)

考法二:相似三角形求值

利用相似比求线段长度或面积。

典型例题:

ABC中,DEBC,AD:DB=2:3,DE=4,求BC。

解题思路:

DEBC,∴△ADE∽△ABC(AA)

AD/AB=DE/BC

AD:DB=2:3,AD:AB=2:5

2/5=4/BC,BC=10

答案:BC=10

考法三:全等+相似综合(压轴题)

南京中考几何压轴题的常见形式。

典型例题:

RtABC中,ACB=90°,AC=6,BC=8,CDAB于D。点E在AC上,EFCD交AB于F。

(1) 求证:ACD∽△CBD;

(2) 若AE=2,求EF。

解题思路:

(1) ∵∠ADC=CDB=90°A+ACD=90°A+B=90°

∴∠ACD=B,∴△ACD∽△CBD(AA)

(2) 先求AB=10,由面积法得CD=4.8,AD=3.6

EFCD,∴△AEF∽△ACD

EF/CD=AE/AC=2/6=1/3

EF=4.8/3=1.6

三、解题技巧总结

技巧一:找条件,选判定

已知两边考虑SSS或SAS;已知两角考虑ASA或AAS;有平行考虑AA相似

技巧二:比例线段转化

相似三角形的对应边成比例,善于利用中间比进行转化。

技巧三:面积比的应用

相似三角形面积比=相似比的平方;同高三角形面积比=底边比。

技巧四:辅助线作法

倍长中线、作垂线、连接对角线、作平行线构造相似

四、真题演练

2023年南京中考】如图,ABCD,AD与BC交于点O,求证:AOB∽△DOC

解析:ABCD,∴∠OAB=ODC,OBA=OCD(内错角相等)

∴△AOB∽△DOC(AA)

2022年南京中考】在ABC中,D、E分别是AB、AC中点,若DE=3,则BC=?

解析:DE是中位线,BC=2DE=6

2021年南京中考】如图,1=2,添加一个条件使ABC∽△ADE

解析:可添加B=D或C=E或AB/AD=AC/AE

五、备考建议

1. 熟记全等、相似的判定定理和性质,做到脱口而出

2. 积累常见几何模型和辅助线作法

3. 证明题书写要规范,每一步注明依据

4. 综合题从简单小问做起,逐步深入

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  1. CONNECT:[ UseTime:0.001181s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001094s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000353s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000318s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000529s ]
  6. SELECT * FROM `set` [ RunTime:0.000224s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000679s ]
  8. SELECT * FROM `article` WHERE `id` = 566601 LIMIT 1 [ RunTime:0.000530s ]
  9. UPDATE `article` SET `lasttime` = 1780349448 WHERE `id` = 566601 [ RunTime:0.000844s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000303s ]
  11. SELECT * FROM `article` WHERE `id` < 566601 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000794s ]
  12. SELECT * FROM `article` WHERE `id` > 566601 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000474s ]
  13. SELECT * FROM `article` WHERE `id` < 566601 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011053s ]
  14. SELECT * FROM `article` WHERE `id` < 566601 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004666s ]
  15. SELECT * FROM `article` WHERE `id` < 566601 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004261s ]
0.163018s