19. 1 graph rotation

19.2 center symmetry

19.3 project exercise

Chapter 20 Circle

20. 1 circle

20.2 Position relation related to circle

20.3 Regular polygons and circles

20.4 Arc length and sector area

Chapter 21 Quadratic function

2 1. 1 quadratic function

2 1.2 Looking at the quadratic equation of one variable from the point of view of function

2 1.3 Practical Problems and Quadratic Functions

Chapter 22 Preliminary Probability

22. 1 probability

22.2 Using enumeration method to find probability

22.3 Using frequency to estimate probability

22.4 Project practice