2, solid geometry preparation strategy.
First, we should have the concept of space. Always regard three-dimensional graphics as plane graphics, can't draw straight views and three views, and can't figure out the relationship between points, lines and surfaces of spatial graphics, so there is no way to do three-dimensional geometry problems. The physical model can be compared with the direct view to improve the spatial imagination of candidates.
Second, consolidate the basic knowledge. The main problem of solid geometry is the positional relationship between points, lines and surfaces, which should be described by angles and distances. There are three kinds of angles in space (dihedral angles formed by lines, lines and planes) and eight kinds of distances (distance between two points, distance between points and straight lines, distance between points and planes, distance between parallel lines, distance between different planes and straight lines, distance between lines and planes, distance between two points on a sphere).