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初三几何课本87页第三题<人教版>.我在证明时,发现了以下三种证明的方法,从得到的辅助线中受益匪浅. 如图,BC为⊙O的直径,AD⊥BC,垂足为D,AB=AF,BF和AD交于E.求证:AE=BE. 证法一如图1.连
Third grade mathematics textbook page 87 third question . When I proved, I found the following three kinds of proof methods, and benefited from the helpline obtained. As shown in the figure, BC is the diameter of ⊙O, AD ⊥ BC, squat foot for D, AB=AF, BF and AD pay in E. Proof: AE=BE. The proof is shown in Figure 1.