几何作图有助于学生深入研究几何图形的性质特点,加深对几何定理的理解和掌握,也有助于锻炼学生的逻辑思维能力、分析能力和动手能力,培养学生学习几何的兴趣.这里,笔者谈谈作图题的解法.1.代数方法例1如图1,已知圆上三点P、Q、R为ABC三条内角平分线与外接圆的交点,求作 Geometry mapping helps students to study the geometric characteristics of geometry, deepen the understanding and mastery of the geometric theorem, but also help to train students ’logical thinking ability, analytical ability and practical ability to cultivate students’ interest in learning geometry. Talking about the solution to the problem .1 algebra method Example 1 As shown in Figure 1, known three points on the circle P, Q, R is 交ABC three angle bisector of the intersection with the circumscribed circle, seeking