旋转实际上是一种全等变换,由于具有可操作性,所以是考查同学们动手能力、观察能力的好素材,也是近几年中考的一个亮点.与图形的旋转变换有关的中考试题不仅设计广泛、形式灵活,而且能较好地展示观察与发现、操作与创造的思维过程.现从2016年中考试卷中采撷数例,供同学们学习时参考.一、旋转后塞线段的长度例1(2016·枣庄)如图1,在△ABC中,∠C=90°,AC=BC=2~(1/2),将△ABC绕点A顺时针方向旋转60°到△AB′C′的位置,连接C′B,则BC′=____. Rotation is actually a congruent transformation, due to its maneuverability, it is a good material to test the students ability to observe, is also a highlight of the mid-term exams in recent years.Compared with the rotation of the graphics in the test questions not only design Extensive, flexible form, and can better display the process of observation and discovery, operation and creation of the thinking process.Currently from the mid-2016 test picks in the number of cases for students to learn when reference. (2016 · Zaozhuang) As shown in Figure 1, in ABC, ∠C = 90 ° and AC = BC = 2 ~ (1/2), rotate ABC around point A clockwise 60 ° to ABAB’C ’ Position, connect C’B, then BC ’= ____.