Chapter 20 Translation and Rotation

20. 1 Translation 20.2 Rotation 20.3 Centrally Symmetric and Centrally Symmetric Graphics 20.4 Design and Appreciation of Patterns

Chapter 21 Functions

2 1. 1 Representation of the Relationship between Variables and Functions 2 1.2 2 1.3 Application of Functions

Chapter 22 Quadrilateral

22. The properties of1parallelogram 22.2 Identification of parallelogram

22.3 triangle midline 22.4 rectangle 22.5 diamond 22.6 square 22.7 trapezoid

22.8 Splicing of Inner and Outer Angles of Polygons with 22.9 Plane Graphics

Chapter 23 Fractional Equation

23. 1 fractional equation 23.2 Application of fractional equation

Chapter XXIV Proposition and Proof (1)

24. 1 Proposition 24.2 Proof of Proposition 24.3 Judgment Theorem of Parallel Lines 24.4 Property Theorem of Parallel Lines

24.5 Theorem of Sum of Interior Angles of Triangle 24.6 Theorem of Determining the Identity of Right Triangle

24.7 Property Theorem and Inverse Theorem of Vertical Line 27.8 Property Theorem and Inverse Theorem of Vertical Line.

Chapter 25 Linear Functions

25. 1 linear function 25.2 images and properties of linear functions

25.3 Method of determining the expression of linear function 25.4 Relationship between linear function and equation and inequality 25.5 Application of linear function

Chapter 26 Representative Value and Dispersion of Data

26. 1 average and weighted average 26.2 median and mode 26.3 variance and standard deviation