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近年来,三角形中含10°整数倍角问题频频出现在各级各类竞赛中.对于此类问题,常用的解法有:对称点法[1],构造法(如构造等边三角形),辅助圆法等等.这些方法构思巧妙,但大多辅助线较多,且无定法,故不易掌握.笔者发现,用三角法可很简易地解决此类问题,而且不用添任何辅助线,可作为
In recent years, the triangle with 10 ° multiples angle frequently appears in all levels of competition. For such problems, commonly used solutions are: symmetry point method [1], the construction method (such as the construction of equilateral triangles), auxiliary circle Method, etc. These methods are cleverly designed, but most of the auxiliary line more, and no fixed method, it is not easy to grasp the author found that the trigonometry can be very simple to solve such problems, but without any auxiliary line can be used as