How to build a rotatory structure (cube, pyramid, square, etc) made of cardboard or a similar material?
i need to make a presentation on a cube or a prism...
It's not clear what you mean by "rotatory."
We assume you need a geometric solid of the right size to hold in your hand and hold up for inspection by a class or group of persons.
Geometric solids are easily made of stiff Bristol board in reasonable sizes. This is the paper board that is used for the backboards of legal pads and stenography pads. Many dry cleaners still use it as inserts for folded shirts. In any case, the material must be stiff enough to stand erect by itself.
Then you lay out the surfaces of the geometric solid on the board with a pencil and drawing instruments (for example, a pyramid is four isosceles triangles and one square) and cut the pieces out with a box knife or large scissors.
Now take some clear cellophane tape such as package sealing tape or "scotch" tape, and tape the edges together to form your object. Work slowly and carefully, and make sure your measurements are correct to get a neat, workmanlike result.
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