1. The long side of a rectangle is called long, the short side is called wide, and the one in the same direction as the horizontal plane is called long, and vice versa. The length and width of a rectangle are relative. Rectangle, also known as rectangle, is a special parallelogram. A parallelogram with a right angle is called a rectangle.
Secondly, on the basis of students' preliminary understanding of rectangle, the definition of rectangle perimeter is put forward. In teaching, we should be good at guiding students to observe, induce and summarize, and cultivate students' ability.
Third, the formula for calculating the circumference of a rectangle is the focus of this lesson, and the teacher should focus on it. Students should not only remember the content of the formula, but also know how the formula is derived. Derivation formula: rectangle circumference = length+width+length+width. On this basis, students are inspired to find out the rules by observing and asking questions, and then the formula of rectangular perimeter is obtained: (length+width) X2.
1, the length and width of a rectangle have a certain relationship with its area, that is, the area of a rectangle = length × width.
2. Given the perimeter and length of the rectangle, find its width.
Width = (perimeter × 2) ÷ 2.
Width = perimeter ÷2- length.
3. Given the perimeter and width of the rectangle, find the length of the rectangle.
Length = (perimeter-width× 2) ÷ 2.
Length = perimeter ÷2- width.
Methods of learning mathematics
1. First of all, we should develop the habit of previewing. This is a good way for me to study mathematics for many years, because I know what I can't do by learning what the teacher should say first in advance, and I have a focus when I study. Of course, it would be better if you taught yourself completely.
2. The second is to do the questions after the book. Preview is not an end. If you have time, you can do examples and exercises after class and check the preview. If you can explain everything, you can learn it. Even if you can't, you can listen to the teacher again.
Step 3, do the homework assigned by the teacher and do it carefully. When you do it, you can write the problem-solving process directly next to the topic, such as multiple-choice questions and fill-in-the-blank questions, because there are many blanks to write in the solution. The advantage of this is that the teacher can keep up with the ideas when talking about the topic, and it is not easy to get distracted.