纵观各省市的中考试卷,圆的知识所占比重较大．题型和特点主要有两类：一是选择题、填空题,二是综合题．第一类题考查圆的基础知识,内容一般包括圆周角、圆心角、直径、弦、弧、直线与圆、圆与圆的位置关系、扇形的弧长与面积、圆锥侧面积的计算等；第二类问题主要与全等三 Looking at the examination papers of all provinces and cities, the proportion of round knowledge is relatively large. There are mainly two types of questions and characteristics: First, multiple choice questions, fill in blank questions, and second, comprehensive questions. The first type of questions examines the basic knowledge of the circle. The content generally includes the circumferential angle, the central angle, the diameter, the chord, the arc, the straight line and the circle, the positional relationship between the circle and the circle, the arc length and area of ​​the sector, and the calculation of the area of ​​the cone side; The second type of problem is mainly with the third