# Shape

A shape is an object that has some form of distinguishable external boundary, surface, or outline. There are many classifications of shapes, some of which are listed below:

- polygons
- points
- lines
- conic sections
- ellipses
- circles
- parabolas
- polyhedra
- cylinders
- cones

These classifications of shapes can be further classified into smaller categories such as shapes that are equilateral, scalene, isosceles, obtuse, acute, square, etc. In reference to geometry, shapes can also be congruent, similar, or isotopic. Learn more about specific shapes by navigating this website.