1. Draw a text box on white paper.
2. Write "Unit 4, Grade 6" in the text box.
3. Draw two-level titles on both sides, and then add the relevant content of "Unit 4, Grade 6" to the second-level title.
4. Add a few smaller branches to the branch, and add relevant content, and the mind map about Unit 4 of Grade 6 will be ready.
Unit 4 Content:
1. Definition of a circle: A circle is a plane figure surrounded by a curve.
2. Center of the circle: Fold a circular piece of paper twice, and the point where the crease intersects the center of the circle is called the center of the circle. Usually represented by the letter o. Its distance to any point on the circle is equal.
3. Radius: The line segment connecting the center of the circle and any point on the circle is called radius. Generally, it is represented by the letter R. If the two feet of a compass are separated, the distance between the two feet is the radius of the circle.
4. Diameter: The line segment whose two ends pass through the center of the circle is called diameter. Generally, the letter D indicates that the diameter is the longest line segment in a circle.
5. The center of the circle determines the position of the circle, and the radius determines the size of the circle.
6. In the same circle or equal circle, there are countless radii and countless diameters. All radii are equal and all diameters are equal.
7. In the same circle or in the same circle, the length of the diameter is twice that of the radius, and the length of the radius is 1/2 of the diameter, which is expressed by letters: d2r or r=d/2.
8. Axisymmetric graphics: If a graphic is folded in half along a straight line, the graphics on both sides can completely overlap. This figure is a straight line, and the crease of an axisymmetric figure on this straight line is called the symmetry axis.
9. Rectangles, squares and circles are symmetrical figures, and they all have axes of symmetry. These figures are all axisymmetric figures.
10, only 1 has an axis of symmetry: angle, isosceles triangle, isosceles trapezoid, sector and semicircle. A figure with only two axes of symmetry is a rectangle.
Methods of learning mathematics well
Read the textbook first and find out the principle.
Second, step by step, focusing on understanding.
Third, practice a lot, insist on brushing questions, and insist on brushing questions.
Fourth, do the questions carefully and clarify the principles.
Fifth, pay attention to sorting out the wrong questions and reflect on the summary.