1, find the key points when encountering rotation, connect the corresponding points, and keep the basic properties in mind.
The nature of rotation is the pain point for many candidates to answer questions, and many candidates are often helpless in the face of rotation problems. In fact, when solving the problem of rotation, we can first find the key points of rotation, then connect the corresponding points and answer according to the basic properties of rotation. For example, before and after rotation, the length and angle of the line segment remain unchanged, but the position has changed.
2. Any polygon can be divided into several triangles, and an equilateral polygon can be restored after being divided.
This formula is mainly aimed at the rotation of polygons. When solving the problem of polygon rotation, any polygon can be divided into several triangles to consider.
For example, a square is divided into two triangles, and then the two triangles are rotated at a certain angle and spliced together to get a rotated square. For equilateral polygons, they can be restored in the same way after segmentation.
3. The midline of the hypotenuse of a right triangle is equal to half of the hypotenuse.
This formula is mainly aimed at the rotation of right triangle. When solving the rotation problem of right triangle, we can use the property that the median line on the hypotenuse of right triangle is equal to half of the hypotenuse.
Junior high school mathematics learning methods;
1, develop good study habits: the habit of previewing new lessons before class, the habit of doing homework carefully, etc. It can help teachers to understand the course content before teaching new courses, help to grasp the key points and listen to lectures with questions, thus improving the quality of classroom learning; The habit of writing homework carefully can not only ensure the beauty and neatness of homework, improve the quality of homework, but also cultivate a meticulous and rigorous style.
2. Seize the classroom time: classroom learning is the most important part of learning, and the benefit of 45 minutes of classroom learning determines the quality of students' academic performance to some extent. Listen carefully, listen with questions and use your head. Raise your hand actively and take notes carefully. Teaching and learning should be two-way communication and mutual promotion.
3. Reflection after doing the problem: This is a very effective way to learn mathematics. By reflecting on every problem we have done, we can sum up what the content is and what methods we have used, so as to make the knowledge string together and work for a long time and build a scientific network system with content and methods.