What does it mean to draw a plane shape visually? What's the point?

This is the basis of helping students to build a three-dimensional spatial structure, and it is also helpful to help students with poor innate spatial perception to improve their ability in this area, which is very important for learning three-dimensional geometry in the future.

Many people think it useless to learn solid geometry. In fact, solid geometry is everywhere in our life. Aside from the work of design, architecture and manufacturing, all these require practitioners to have a certain degree of stereoscopic perception. Let me give you a few small examples in life. For example, when driving, you should use your own spatial perception ability to judge the various road conditions ahead, and when reversing, you need spatial perception ability to judge the surrounding environment so as not to hit the wall or other people's cars. For example, when we go shopping or buy a house, supermarkets, clothing stores, snack bars, house decoration and so on. For the goods in the store, tables and chairs, home decoration, you need to use three-dimensional geometric knowledge. Whether in a shop or at home, whether the goods are placed well or not directly affects whether we want to go in or live in it.

Visible solid geometry is very important. The basis of learning solid geometry is to learn plane graphics well and combine plane graphics with solid graphics. Just like the last master in the martial arts movie, I didn't understand why I was squatting at first!