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学习了三角形的内角和等于180°这一定理及三角形的一个外角等于和它不相邻的两个内角的和这一推论后,对于某些与角度有关的求值问题,巧用该定理,能获得顺利的解答.
After learning the inference of the internal angle of a triangle and the theorem equal to 180° and the sum of an external angle of a triangle equal to the sum of two internal angles that are not adjacent to it, this theorem is used wisely for some angle-dependent evaluation problems. Can get a smooth solution.