1. From the objects in life, abstract geometric figures (cuboids, cubes).
2. Explore the characteristics of cuboid (cube) from three aspects: face, edge and vertex.
3. Find the sum of side lengths
Second, compare similarities and differences and look for relationships.
Four. additional remarks
The opposite sides are parallel to each other, and the adjacent sides are perpendicular to each other.
Fifth, learn from, think about and expand.
The reference mentioned the teaching suggestion of the eighth question in the textbook. I have doubts about the following sentence: "If ① a square with a side length of 2㎝ is used as the left side of the cuboid, ② a rectangle with a length of 2㎝ and a width of 4cm is used as the bottom side of the cuboid ..."
If the bottom is 2 cm long and the width is 4 cm, the left side of the cuboid is not a square with a side length of 2 cm. Why not say that the bottom is a rectangle with a length of 4㎝ and a width of 2cm?
Or did the faculty tell us that the length and width of the cuboid are arbitrary?
With this question, I consulted the information and asked researcher Li to answer the question: in a cuboid, the positions of length, width and height are not fixed. ...
If you are interested, you can check out the following articles.
1. Studio: How to define the length and width of a cuboid?
2. How to define the length, width and height of a cuboid?
3. Teaching question and answer: How to define the length and width in a cuboid?
Special thanks to the teacher for answering questions and sharing articles ~ helping peers on the way to teaching.