Rational Quadrilateral
A rational quadrilateral is a Quadrilateral for which the sides, Diagonals, andArea are Rational. The simplest case has sides 
, 
, 
, and 
andDiagonals of length 
and 
.
- Parabolic Rotation
- Parabolic Segment
- Parabolic Spindle Cyclide
- Parabolic Spiral
- Parabolic Umbilic Catastrophe
- Paraboloid
- Paraboloidal Coordinates
- Paraboloid Geodesic
- Paracompact Space
- Paracycle
- Paradox
- Paradromic Rings
- Paragyrate Diminished Rhombicosidodecahedron
- Parallel
- Parallel Axiom
- Parallel Class
- Parallel Curve
- Parallelepiped
- Parallelism
- Parallelizable
- Parallelogram
- Parallelogram Illusion
- Parallelogram Law
- Parallelohedron
- Parallelotope