Abstract: The geometry of space

\nIn its activities throughout a person confront with the need to ponder the shape, size, relative sic of spatial figures. such(prenominal) problems are solved by astronomers and wading with the large scale, and physicists who information the structure of atoms and molecules. separate geometry, which studies such problems, called stereometry (from the classic stereoselective - ​​surround, spatial).\nIt may count paradoxical, provided in fact the image of horizontal in prostrate geometry, plane geometry - no need. afterwards all, if we, for example, say that in the plane of the polygon given point, we thusly assume that such points exist international this plane. In plane geometry, this assumption superfluous: ​​everything happens in the same single plane. In solid geometry, we form to have to deal with several planes. In each of them anticipate in cram all know planimetry of definitions and theorems related to points, lines, distances, etc. , but the properties themselves planes must be described separately.