A surface represents the geometry associated with a physical part. A surface is a two-dimensional geometric entity that
may be used in automatic mesh generation.
Solids are closed volume of surfaces that can take any shape. Solids are three-dimensional entities that can be used in
automatic tetra and solid meshing.
Create and edit circles and rectangles with the Shapes tool.
Create and Edit Circles
Use the Circles tool to create circles for geometry construction, edit free circles, and create/toggle filled circles (for example, disk surfaces).
Create and Edit Rectangles
Use the Rectangles tool to create rectangles for geometry construction, edit free rectangles, and create/toggle filled rectangles.