The opposite side refers to the side opposite to a corner. For example, the opposite side of ∠A is BC, the opposite side of ∠B is AC and the opposite side of ∠C is AB.
Commonly used in mathematical geometry problems, it is a proper noun in mathematics. "Right" here should mean "opposite".
1. In a triangle, the opposite side is the opposite side of the selected angle. For example: triangle △ABC, the opposite side of angle A is side BC.
2. In quadrilateral, especially parallelogram, the opposite side is parallel and equal to the selected side.
3. A regular tetrahedron has six sides. Each edge intersects the other four edges, leaving one edge. These two sides are opposites.
Math learning skills: actively think about the questions raised by teachers and classmates, so that you can always devote yourself to teaching activities, which is an important guarantee to improve learning quality and efficiency. Students' thinking and answering questions are generally required to be well-founded, organized and logical. With the growth of age, we should gradually infiltrate mathematical ideas such as association, hypothesis and transformation when thinking about problems, and constantly improve the quality and speed of thinking about problems.
A mathematical concept needs to remember the name, describe the essential attributes, realize the scope involved, and use the concept to make accurate judgments. These questions are not required by teachers. Without learning methods, it is difficult for students to study regularly.
In the second semester of senior one, students have just started to learn solid geometry, and students always find it difficult to get started. Many old teachers agree with the following methods, which can be carried out in class or taught by themselves. Look at the questions and draw pictures. (Look, write) Examine the questions and find ideas (Listen to the teacher's explanation) Read the proof process in the book. Recall and write the proof process.
To accumulate proof ideas of various geometric problems, we need to know some proof skills. In this way, we can achieve the above goal by focusing on the teacher's explanation or reading some geometric proof questions.