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有关10°倍数问题的探究,一般情况下都比较棘手,但也能引人入胜,让人欲罢不能.多年前曾活跃于一些竞赛中,偶尔出现于初中的能力检测.基本思路是构造全等三角形或等边三角形,有时利用圆中的角来沟通已知和未知的关系.文[1]通过对兰利问题进行探究,以20°、80°的关系为切入口获得一种较为简单的解法,步步符合情理,藏神奇于平淡之中,令人赏心悦目.学生经历了这种思路的探究后,如果再提供几道类似的题目让学生自主
The inquiry about 10 multiples is generally tricky but intriguing and tempting, and has been active in some contests years ago and occasionally occurs in junior high school. The basic idea is to construct congruent triangles or the like Edge triangles, sometimes using the corners of the circle to communicate the known and unknown relationship.Wen [1] through the exploration of Langley problem, with a 20 °, 80 ° relationship as the cut-in to obtain a relatively simple solution, step Steps in line with the reasonable, possession of magic in plain, it is pleasing to the eye .Students experienced the exploration of this idea, if we provide a few more similar topics for students to autonomy