小结................................................................................. ...............57

第二十四章 圆

24.1.1 圆........................................................................... ......59

24．1．2 垂直于弦的直径.....................................................................62

24．1．3 弧、弦、圆心角.................................... ..............................66

24.1.4 圆周角......................................................... ...........................70

24.2.2 直线和圆的位置关系.......................................... ........................77

24.2.3 圆和圆的位置关系............................................. ...............80

24．3 正多边形和圆..............................................................................85

24.4圆锥的侧面积和全面积.....................................................................90

小结...................................................................................................93

第二十五章 概率

25.1.1随机事件(第一课时)................................................ .....................96

25.1.1 随机事件（第二课时）..................................................................98

25.1.2 概率的意义....................................... ............ ...............100

25.2 用列举法求概率(第一课时)............................................................104

25.2 用列举法求概率(第二课时)............................................................107

25.2 用列举法求概率(第三课时) .................................... .....................109

25.3.1利用频率估计概率.....................................................................111

25.3.2利用频率估计概率.....................................................................113

25.4课题学习 键盘上字母的排列规律......................................................115

小结...................................................................................................117