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与圆有关的几何问题一般比较灵活,若画图片面,考虑不周,很容易漏解,造成解题错误.下面本文结合例题介绍五类与圆有关的常见多解易错问题,供同学们学习使用:第一类:忽视点的可能位置例1△ABC是半径为2的圆的内接三角形,若BC=23~(1/2),则∠4的度数为____。错解如图1所示,在Rt△BOD中,OB=2,BD=
Circle-related geometric problems are generally more flexible, if drawing pictures, ill-considered, it is easy to leak solution, resulting in problem-solving error. The following article with examples of five kinds of circle-related common solution to multiple errors, for students Learning to use: The first category: ignoring the possible location of the point Example 1 △ ABC is a circle with a radius of 2 inscribed triangle, if BC = 23 ~ (1/2), then ∠ 4 degrees ____. The wrong solution shown in Figure 1, in Rt △ BOD, OB = 2, BD =