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圆内经常用到有关切线长的计算问题,每次做题时,无论选择题、填空题,还是解答题,学生们都是在反复证明切线长公式.本文的目的是希望不要总是重复一些基本工作,而是通过学生的探索努力去找寻一类公式,在不增加定理、公式个数的前提下,既培养了探索精神,又展示了数学的美,还节省了做选择题、填空题的时间,符合数学中的“缩略式”思维的要求.
The circle is often used to calculate the length of the tangent, each question, whether multiple-choice questions, fill in the blank questions, or answer questions, the students are repeatedly proved that the tangent length formula.The purpose of this paper is to not want to always repeat some of the basic Work, but through the exploration of students to find a class of formulas, without increasing the number of theorems, formulas, not only cultivate the spirit of exploration, but also shows the beauty of mathematics, but also saves the multiple choice, fill in the blank Time, in line with mathematical “abbreviated ” thinking requirements.