This type of question is the most basic requirement for eighth-grade students' reasoning and problem-solving ability, so this type of question can be said to be a compulsory knowledge point in the eighth-grade mid-term exam.

(2) Comprehensive proof of moderately difficult triangles.

To solve the moderately difficult problem of congruent triangles's proof, we must memorize all the theorems and properties we have learned and establish a perfect knowledge system. Second, we should be familiar with the practice of common auxiliary lines.

(3) Painting questions

Drawing mainly requires making axisymmetric figures, angular bisectors and line segments in perpendicular bisector and congruent triangles.

(4) The basic concept of the chapter "Triangle" of 4)Xi.

Other issues are relatively basic, so I won't go into details here.

Chapter 12 The basic concept of congruent triangles.

When calculating the length of a line segment or the number of angles in a triangle, we should not only grasp the relevant theorems and properties quantitatively, but also apply equivalent substitution and global substitution.

(6) Chapter 13 Basic concepts of axial symmetry

Axisymmetric chapter has two very important theorem properties, one is the three-line unity theorem of isosceles triangle, and the other is that the right angle side facing 30 degrees in a right triangle is half of the hypotenuse.