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《中学生数学》2013年9月(下)刊登了张万录老师的《利用圆的定义引设辅助圆》一文,读后感觉方法新颖,开阔视野.本人发现还有一种类型题也可通过引设辅助圆求得解决.当题目条件中有且只有一个定端点的定长线段时,可考虑以定端点为圆心,定长为半径作辅助圆,利用圆的有关性质解题,下面举例说明.
“High School Students Mathematics” published in September 2013 (below) published by Zhang Wansu teacher, “the use of the definition of a circle cited the auxiliary circle,” a sense of novel after reading, broaden their horizons. I found there is also a type of problem can also be cited auxiliary circle When there is only one fixed-length segment in the title condition, the center of the fixed point can be considered as the center and the radius of the fixed circle as the auxiliary circle, which can be solved by the relevant properties of the circle. The following is an example.