Rectangle
A closed planar Quadrilateral with opposite sides of equal lengths 
and 
, and with four Right Angles. The Area of the rectangle is
and its Diagonals are of length
A Square is a degenerate rectangle with
.See also Golden Rectangle, Perfect Rectangle, Square
References
Beyer, W. H. (Ed.) CRC Standard Mathematical Tables, 28th ed. Boca Raton, FL: CRC Press, p. 122, 1987. Eppstein, D. ``Rectilinear Geometry.''http://www.ics.uci.edu/~eppstein/junkyard/rect.html.
- Confluent Hypergeometric Function of the Second Kind
- Confluent Hypergeometric Limit Function
- Confocal Conics
- Confocal Ellipsoidal Coordinates
- Confocal Parabolic Coordinates
- Confocal Paraboloidal Coordinates
- Conformal Latitude
- Conformal Map
- Conformal Solution
- Conformal Tensor
- Conformal Transformation
- Congruence
- Congruence Axioms
- Congruence (Geometric)
- Congruence Transformation
- Congruent
- Congruent Incircles Point
- Congruent Isoscelizers Point
- Congruent Numbers
- Congruum
- Congruum Problem
- Conic
- Conical Coordinates
- Conical Frustum
- Conical Function