志鸿同步测控设计2015-2016学年北师大版数学选修4-1全册课件 1.2.1 圆与直线

1、-1-2 2圆与直线圆与直线-2-2 2.1 1圆周角定理-3-2.1圆周角定理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.理解并掌握圆周角定理.2.理解并掌握圆周角定理的两个推论.-4-2.1圆周角定理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12-5-2.1圆周角定理ZHISHI SHULI知识梳理ZHONGNAN JVJIAO重难

2、聚焦SUITANGYANLIAN随堂演练DIANLI TOUXI典例透析MUBIAODAOHANG目标导航12-6-2.1圆周角定理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12-7-2.1圆周角定理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12-8-2.1圆周角定理ZHISHI SHULI知识梳理ZHONGNAN JVJIAO重难聚焦S

3、UITANGYANLIAN随堂演练DIANLI TOUXI典例透析MUBIAODAOHANG目标导航12-9-2.1圆周角定理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12-10-2.1圆周角定理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“分类”与“转化”剖析:(1)分类.在证明圆周角定理时,首先对圆心的位置分类:圆心在圆周角的一边上、圆

4、心在圆周角内部、圆心在圆周角外部,对这三种情况分别给出了证明,这体现了数学中的分类讨论思想,也就是在解决一个问题时,无法用同一种情形去解决,而需要将问题划分成几个不同形式的小问题,将这些小问题加以逐个解决,从而使问题得到解决,这就是分类讨论思想.当数学问题中的条件、结论不明确或题意中含参数或图形不确定时,就应分类讨论.其优点是一方面可将复杂的问题分解成若干个简单的问题,另一方面恰当的分类可避免丢值漏解.-11-2.1圆周角定理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

5、航(2)转化.在圆周角定理证明中,先证明了第一种情况圆心在圆周角的一边上,再证明后两种情况时,都转化为第一种情况,这体现数学中的转化与化归思想,也就是将未知的、陌生的、复杂的问题通过演绎归纳转化为已知的、熟悉的、简单的问题,从而使问题顺利解决的数学思想,这就是转化与化归思想,其功能是:生疏化成熟悉,复杂化成简单,抽象化成直观,含糊化成明朗.一般是将复杂问题通过变换转化为简单问题;将难解的问题通过变换转化为容易求解的问题;将未解决的问题通过变换转化为已解决的问题.-12-2.1圆周角定理ZHISHI SHULI知识梳理ZHONGNAN JVJIAO重难聚焦SUITANGYANLIAN随堂演练DI

6、ANLI TOUXI典例透析MUBIAODAOHANG目标导航题型一题型二题型三-13-2.1圆周角定理ZHISHI SHULI知识梳理ZHONGNAN JVJIAO重难聚焦SUITANGYANLIAN随堂演练DIANLI TOUXI典例透析MUBIAODAOHANG目标导航题型一题型二题型三-14-2.1圆周角定理ZHISHI SHULI知识梳理ZHONGNAN JVJIAO重难聚焦SUITANGYANLIAN随堂演练DIANLI TOUXI典例透析MUBIAODAOHANG目标导航题型一题型二题型三-15-2.1圆周角定理ZHISHI SHULI知识梳理ZHONGNAN JVJIAO重难聚

7、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三-16-2.1圆周角定理ZHISHI SHULI知识梳理ZHONGNAN JVJIAO重难聚焦SUITANGYANLIAN随堂演练DIANLI TOUXI典例透析MUBIAODAOHANG目标导航题型一题型二题型三-17-2.1圆周角定理ZHISHI SHULI知识梳理ZHONGNAN JVJIAO重难聚焦SUITANGYANLIAN随堂演练DIANLI TOUXI典例透析MUBIAODAOHANG目标导航题型一题型二题型三-18-2.1圆周角定理ZHISHI SHULI知

8、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三-19-2.1圆周角定理ZHISHI SHULI知识梳理ZHONGNAN JVJIAO重难聚焦SUITANGYANLIAN随堂演练DIANLI TOUXI典例透析MUBIAODAOHANG目标导航题型一题型二题型三-20-2.1圆周角定理ZHISHI SHULI知识梳理ZHONGNAN JVJIAO重难聚焦SUITANGYANLIAN随堂演练DIANLI TOUXI典例透析MUBIAODAOHANG目标导航题型一题型二题型三-21-

9、2.1圆周角定理ZHISHI SHULI知识梳理ZHONGNAN JVJIAO重难聚焦SUITANGYANLIAN随堂演练DIANLI TOUXI典例透析MUBIAODAOHANG目标导航题型一题型二题型三-22-2.1圆周角定理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 2 3 4 5-23-2.1圆周角定理ZHISHI SHULI知识梳理ZHONGNAN JVJIAO重难聚焦SUITANGYANLIAN随堂演练DIANLI TOUXI典例透析MUBIAODAO

10、HANG目标导航1 2 3 4 5-24-2.1圆周角定理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 2 3 4 5-25-2.1圆周角定理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 2 3 4 5-26-2.1圆周角定理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 2 3 4 5-27-2.1圆周角定理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 2 3 4 5-28-2.1圆周角定理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 2 3 4 5-29-2.1圆周角定理ZHISHI SH