Three-dimensional geometric model

Abstract

The invention discloses a three-dimensional geometric model, which relates to the field of mathematics teaching aids. Four elastic lines are connected between the bottom plate and the flap of the three-dimensional geometric model. The four elastic lines are fixed on the same point on the flip plate, and the four elastic lines are fixed on the bottom plate. on the four vertices of the square. When in use, the base plate can be placed on the podium, and when the flap is opened, the four elastic lines and the base plate form a three-dimensional shape of a pentahedron, and the four elastic lines are fixedly connected to the base plate, which means that no matter how the flap is turned, the elastic lines are stretched , the bottom area of ​​the pentahedron remains constant, but the height of the pentahedron changes. You can use a ruler to measure the vertical distance between the endpoint of the elastic line on the flap and the bottom plate at any time. The larger the volume of the model. The three-dimensional geometric model is not only simple and clear in structure, but also movable, and can explain the relationship between the volume and height of the three-dimensional shape, and the display effect is good.

Description

technical field [0001] The invention relates to the field of mathematics teaching aids, in particular to a three-dimensional geometric model. Background technique [0002] In the teaching of high school mathematics courses, the chapter of solid geometry is a very important teaching content. In order to cultivate students' three-dimensional thinking ability, teachers often make some three-dimensional models to facilitate the explanation of three-dimensional geometry knowledge. Most of the existing three-dimensional models are fixed structures and cannot be moved. As a result, many models need to be manufactured when explaining some geometric knowledge, which is very troublesome to use and has poor display effect. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a three-dimensional geometric model, which has a simple and clear structure, is movable, can explain the relationship between volume and height of a three-...

AI Technical Summary

Problems solved by technology

Most of the existing three-dimensional models are fixed structures and cannot be moved. As a result, many models need to be manufactured when explaining some geometric knowledge. It is very troublesome to use and the display effect is poor.

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