Parallelogram

Parallelogram
Rank	2
Space	Spherical
Notation
Bowers style acronym	Par
Elements
Edges	2+2
Vertices	2+2
Vertex figure	Dyad
Measures (edge length 1)
Central density	1
Related polytopes
Army	Par
Regiment	Par
Dual	Parallelogram
Conjugate	Parallelogram
Abstract properties
Euler characteristic	0
Topological properties
Orientable	Yes
Properties
Symmetry	K2+, order 2
Convex	Yes
Nature	Tame

The parallelogram is a convex quadrilateral with inversion symmetry and two pairs of parallel sides. The opposite sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure.

Special cases of a parallelogram:

• Rectangle – A parallelogram with four angles of equal size (right angles).
• Rhombus – A parallelogram with four sides of equal length.
• Square – A parallelogram with four sides of equal length and angles of equal size (right angles).

External links

• Bowers, Jonathan. "Regular Polygons and Other Two Dimensional Shapes".