圆的弦心距、半弦长、半径构成直角三角形,简称“弦心三角形”.近几年高考题中与圆相关的考题频频出现,很多学生处理此类问题时依然套用解决圆锥曲线的思路,使问题复杂化,而且导致运算量很大.为了引导学生回避“小题大做”.在平时教学中应该向学生灌输“圆”与其他圆锥曲线的整体处理思路和方法是大不相同的.相对来讲,尽管其他圆锥曲线运算量大,但其方法反而比较固定,而圆 The round string center distance, half chord length, and radius constitute a right-angled triangle, abbreviated as “string-core triangle.” In recent years, questions related to circles have appeared frequently in college entrance examination questions, and many students still apply the solution to conic curves when dealing with such problems. The thoughts complicate the problem and lead to a large amount of calculations. In order to guide students to evade the issue, the whole idea and method of instilling the “circle” and other conical curves in the usual teaching is large. Not the same. Relatively speaking, although other conical curves are computationally intensive, their methods are rather fixed and the circle