Terms:

There are a number of terms  are used in geometry.

1. A plane is a flat surface.

2. Space is the set of all points.

3. Surface is the boundary of a solid.

4. Solid is a three-dimensional geometric figure.

5. Plane geometry is the geometry of planar figures (two dimensions). Examples are:  angles, triangles, circles, and parallelograms.

6. Solid geometry is the geometry of three-dimensional figures. Examples are: cylinders, cubes, and spheres.