1)
When an isosceles triangle is encountered, it can be used as the height of the base. Using the property of "three lines in one" to solve problems, the way of thinking is "folding in half" in congruence transformation.
2)
When the triangle intersects with the midpoint or midline, the congruent triangles can be constructed as the midline or double-length midline. The thinking mode used in congruence transformation is "rotation". It can also be rotated directly if necessary.
3)
When you meet the bisector, you can draw vertical lines on both sides of a point like an angle on the bisector. The thinking mode used is "folding in half" in triangle congruence transformation, and the knowledge points examined are often the property theorem or inverse theorem of bisector.
4)
The truncation method is to intercept a line segment on a line segment to make it equal to a specific line segment, or extend a line segment to make it equal to a specific line segment, and then explain it by the related properties of triangle congruence. This method is suitable for proving the sum, difference, multiplication and classification of line segments.
5)
Equal area method: Find the area of triangle (or other figure) by different methods to solve the problem between line segments.
6)
When encountering the midline of a line segment, the points on the midline connecting the line segment are equal to the distance between the two ends of the line segment.
7)
When you meet a right triangle, make the center line on the hypotenuse of the right triangle.
8)
In the case of special angle, consider making an equilateral triangle