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1 教学目的(1)复习巩固相交弦定理,切割线定理.(2)学习一般解题方法,发展思维.(3)渗透个性与共性的辩证思想:培养观察、比较、分析、归纳的能力;进行审美教育.2 教学原则:既教证明又教猜想3 教学方式:讨论式4 教学过程4.1 复习引入(为后文研讨按下伏笔)(1)口答并说出所应用的定理:①已知,如图1,PT切⊙O于T,PT=6,AB=5,则:PB=_
1 Objectives of teaching (1) Review and consolidate intersecting string theorem, cutting line theorem. (2) Learn general problem-solving methods and develop thinking. (3) Dialectical ideas that permeate personality and commonality: develop the ability to observe, compare, analyze, and generalize; Conduct aesthetic education. 2 Teaching principles: teaching and teaching conjecture 3 teaching methods: discussion 4 teaching process 4.1 introduction of review (press for the discussion of the later discussion) (1) answer and say the applied theorem: 1 known, As shown in Figure 1, if PT cuts O to T, PT=6 and AB=5, then: PB=_