Taking three cubes, we successively cut them with a plane, and got seven different sections:
- two regular triangles, differing in their size;
- regular hexagon. Here it can be seen on video.
As you probably guess, this is not all possible polygons that can be obtained by cutting a cube.
But if the classic cube cuts seemed boring to you, then here is the story told in 1693 by the English mathematician John Wallis.
Prince Rupert of Palatinate argued that in a cube you can cut a hole large enough to be able to drag a cube of the same size through it.
Prince Rupert of Palatinate (germ. Ruprecht) (1619–1682).
Rupert is one of the founders of the Hudson's Bay Company and its first manager. In 1646–1648, Rupert led British units as part of the French army. In addition, he was a talented inventor, as well as an excellent engraver who introduced the mezzotint technique in England.
In one of the cubes you need to make a through hole.
To fit a cube into this hole, the size of the hole must be a suitable size.
Which one Most likely, this should be the smallest hole area. In this case, the size of the hole will be square and equal to the area of the side of the cube. In such a square hole a cube can pass.
With the shape of the hole, we decided - it is a square equal to the side of the cube. Now let's try to rotate the second cube so that a square hole can be made inside the first (green) one. The complexity of the problem is that it is an internal opening, and the outer walls of the cut cube would be inseparable.
One can specify the following mathematical characteristics in each of the five Platonic solids: 1....