高中数学1.2.4切割线定理北师大版选修4-1课稿.ppt

-*- 2.4　切割线定理 -*- 2.4　切割线定理 ZHISHI SHULI 知识梳理 ZHONGNAN JVJIAO 重难聚焦 SUITANGYANLIAN 随堂演练 DIANLI TOUXI 典例透析 MUBIAODAOHANG 目标导航 1.理解并掌握切割线定理及推论. 2.理解并掌握切割线定理的逆定理. 3.能够熟练地应用切割线定理及推论解决相关问题. ZHISHI SHULI 知识梳理 ZHONGNAN JVJIAO 重难聚焦 SUITANGYANLIAN 随堂演练 DIANLI TOUXI 典例透析 MUBIAODAOHANG 目标导航 1 2 3 ZHISHI SHULI 知识梳理 ZHONGNAN JVJIAO 重难聚焦 SUITANGYANLIAN 随堂演练 DIANLI TOUXI 典例透析 MUBIAODAOHANG 目标导航 1 2 3 ZHISHI SHULI 知识梳理 ZHONGNAN JVJIAO 重难聚焦 SUITANGYANLIAN 随堂演练 DIANLI TOUXI 典例透析 MUBIAODAOHANG 目标导航 1 2 3 ZHISHI SHULI 知识梳理 ZHONGNAN JVJIAO 重难聚焦 SUITANGYANLIAN 随堂演练 DIANLI TOUXI 典例透析 MUBIAODAOHANG 目标导航 1 2 3 ZHISHI SHULI 知识梳理 ZHONGNAN JVJIAO 重难聚焦 SUITANGYANLIAN 随堂演练 DIANLI TOUXI 典例透析 MUBIAODAOHANG 目标导航 1 2 3 ZHISHI SHULI 知识梳理 ZHONGNAN JVJIAO 重难聚焦 SUITANGYANLIAN 随堂演练 DIANLI TOUXI 典例透析 MUBIAODAOHANG 目标导航 1 2 3 ZHISHI SHULI 知识梳理 ZHONGNAN JVJIAO 重难聚焦 SUITANGYANLIAN 随堂演练 DIANLI TOUXI 典例透析 MUBIAODAOHANG 目标导航 ZHISHI SHULI 知识梳理 ZHONGNAN JVJIAO 重难聚焦 SUITANGYANLIAN 随堂演练 DIANLI TOUXI 典例透析 MUBIAODAOHANG 目标导航 题型一 题型二 题型三 题型四 ZHISHI SHULIZHISHI SHULIZHISHI SHULIZHISHI SHULI 知识梳理知识梳理知识梳理知识梳理 ZHONGNAN JVJIAOZHONGNAN JVJIAOZHONGNAN JVJIAOZHONGNAN JVJIAO 重难聚焦重难聚焦重难聚焦重难聚焦 SUITANGYANLIANSUITANGYANLIANSUITANGYANLIANSUITANGYANLIAN 随堂演练随堂演练随堂演练随堂演练 DIANLI TOUXIDIANLI TOUXIDIANLI TOUXIDIANLI TOUXI 典例透析典例透析典例透析典例透析 MUBIAODAOHANGMUBIAODAOHANGMUBIAODAOHANGMUBIAODAOHANG 目标导航目标导航目标导航目标导航 题型一 题型二 题型三 题型四 证明:如图所示,连接BC,BD. ∵E为的中点,∴∠DBE=∠CBE. 又AB是☉O的切线, ∴∠ABC=∠CDB. ∴∠ABC+∠CBE=∠DBE+∠CDB. 又∠ABF=∠ABC+∠CBE, ∠AFB=∠DBE+∠CDB, ∴∠ABF=∠AFB. ∴AB=AF. 又AB是☉O的切线,ACD为割线,由切割线定理可知AB2=AC·AD,∴AF2=AC·AD. ? ZHISHI SHULI 知识梳理 ZHONGNAN JVJIAO 重难聚焦 SUITANGYANLIAN 随堂演练 DIANLI TOUXI 典例透析 MUBIAODAOHANG 目标导航 题型一 题型二 题型三 题型四 ZHISHI SHULIZHISHI SHULIZHISHI SHULIZHISHI SHULI 知识梳理知识梳理知识梳理知识梳理 ZHONGNAN JVJIAOZHONGNAN JVJIAOZHONGNAN JVJIAOZHONGNAN JVJIAO 重难聚焦重难聚焦重难聚焦重难聚焦 SUITANGYANLIANSUITANGYANLIANSUITANGYANLIANSUITANGYANLIAN 随堂演练随堂演练随堂演练随堂演练 DIANLI TOUXIDIANLI TOUXIDIANLI TOUXIDIANLI TOUXI 典例透析典例透析典例透析典例透析 MUBIAODAOHANGMUBIAODAOHANGMUBIAODAOHANGMUBIAODA