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在平行线、垂线和角平分线的三个条件中,只需要满足两个条件就可证出等腰三角形,下面举例说明其基本图形的应用,以供参考.例1如图,已知,OD、OE为∠BOC、∠AOC的角平分线,MN∥AB交OE、OC、OD于M、P、N.求证MP=PN.析本例中条件有三个,但可分成两类,可找到“角平分线+平行线→等腰三角形”这一基本图形,可得OP
In the three conditions of parallel line, perpendicular line and angle bisector, only two conditions are required to prove the isosceles triangle, and the following is an example of the application of its basic figure for reference. , OD, OE for ∠BOC, 角AOC angle bisector, MN∥AB to pay OE, OC, OD in M, P, N. Prove MP = PN. Analysis of the conditions in this case there are three, but can be divided into two categories, You can find the “angle bisector + parallel lines → isosceles triangle” This basic graphics, available OP