Editing Shape (section)

== Classification of simple shapes ==
{{Main|Lists of shapes}}
[[File:Polygon types.svg|thumb|right|300px|A variety of [[polygon]]al shapes.]]

Some simple shapes can be put into broad categories. For instance, [[polygon]]s are classified according to their number of edges as [[triangle]]s, [[quadrilateral]]s, [[pentagon]]s, etc. Each of these is divided into smaller categories; triangles can be [[equilateral]], [[isosceles]], [[obtuse triangle|obtuse]], [[Triangle#By internal angles|acute]], [[Triangle|scalene]], etc. while quadrilaterals can be [[rectangle]]s, [[rhombi]], [[trapezoids]], [[squares]], etc.

Other common shapes are [[Point (geometry)|points]], [[line (geometry)|lines]], [[plane (geometry)|planes]], and [[conic sections]] such as [[ellipse]]s, [[circle]]s, and [[parabola]]s.

Among the most common 3-dimensional shapes are [[polyhedra]], which are shapes with flat faces; [[ellipsoid]]s, which are egg-shaped or sphere-shaped objects; [[cylinder (geometry)|cylinders]]; and [[cone]]s.

If an object falls into one of these categories exactly or even approximately, we can use it to describe the shape of the object. Thus, we say that the shape of a [[manhole cover]] is a [[disk (mathematics)|disk]], because it is approximately the same geometric object as an actual geometric disk.