志鴻同步測控設(shè)計2015-2016學(xué)年北師大版數(shù)學(xué)選修4-1全冊課件 1.2.1 圓與直線

1、-1-2 2圓與直線圓與直線-2-2 2.1 1圓周角定理-3-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航1.理解并掌握圓周角定理.2.理解并掌握圓周角定理的兩個推論.-4-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航12-5-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難

2、聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航12-6-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航12-7-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航12-8-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦S

3、UITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航12-9-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航12-10-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航“分類”與“轉(zhuǎn)化”剖析:(1)分類.在證明圓周角定理時,首先對圓心的位置分類:圓心在圓周角的一邊上、圓

4、心在圓周角內(nèi)部、圓心在圓周角外部,對這三種情況分別給出了證明,這體現(xiàn)了數(shù)學(xué)中的分類討論思想,也就是在解決一個問題時,無法用同一種情形去解決,而需要將問題劃分成幾個不同形式的小問題,將這些小問題加以逐個解決,從而使問題得到解決,這就是分類討論思想.當(dāng)數(shù)學(xué)問題中的條件、結(jié)論不明確或題意中含參數(shù)或圖形不確定時,就應(yīng)分類討論.其優(yōu)點是一方面可將復(fù)雜的問題分解成若干個簡單的問題,另一方面恰當(dāng)?shù)姆诸惪杀苊鈦G值漏解.-11-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)

5、航(2)轉(zhuǎn)化.在圓周角定理證明中,先證明了第一種情況圓心在圓周角的一邊上,再證明后兩種情況時,都轉(zhuǎn)化為第一種情況,這體現(xiàn)數(shù)學(xué)中的轉(zhuǎn)化與化歸思想,也就是將未知的、陌生的、復(fù)雜的問題通過演繹歸納轉(zhuǎn)化為已知的、熟悉的、簡單的問題,從而使問題順利解決的數(shù)學(xué)思想,這就是轉(zhuǎn)化與化歸思想,其功能是:生疏化成熟悉,復(fù)雜化成簡單,抽象化成直觀,含糊化成明朗.一般是將復(fù)雜問題通過變換轉(zhuǎn)化為簡單問題;將難解的問題通過變換轉(zhuǎn)化為容易求解的問題;將未解決的問題通過變換轉(zhuǎn)化為已解決的問題.-12-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DI

6、ANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航題型一題型二題型三-13-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航題型一題型二題型三-14-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航題型一題型二題型三-15-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚

7、焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航題型一題型二題型三-16-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航題型一題型二題型三-17-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航題型一題型二題型三-18-2.1圓周角定理ZHISHI SHULI知

8、識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航題型一題型二題型三-19-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航題型一題型二題型三-20-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航題型一題型二題型三-21-

9、2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航題型一題型二題型三-22-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航1 2 3 4 5-23-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAO

10、HANG目標導(dǎo)航1 2 3 4 5-24-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航1 2 3 4 5-25-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航1 2 3 4 5-26-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航1 2 3 4 5-27-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航1 2 3 4 5-28-2.1圓周角定理ZHISHI SHULI知識梳理ZHONGNAN JVJIAO重難聚焦SUITANGYANLIAN隨堂演練DIANLI TOUXI典例透析MUBIAODAOHANG目標導(dǎo)航1 2 3 4 5-29-2.1圓周角定理ZHISHI SH