Elliptic Geometry
A constant curvature Non-Euclidean Geometry which replaces the Parallel Postulate with the statement ``throughany point in the plane, there exist no lines Parallel to a given line.'' Elliptic geometry is sometimes also calledRiemannian Geometry. It can be visualized as the surface of a Sphere onwhich ``lines'' are taken as Great Circles. In elliptic geometry, the sum of angles of aTriangle is 
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- Quartile Variation Coefficient
- Quasiamicable Pair
- Quasiconformal Map
- Quasigroup
- Quasiperfect Number
- Quasiperiodic Function
- Quasiperiodic Motion
- Quasirandom Sequence
- Quasiregular Polyhedron
- Quasirhombicosidodecahedron
- Quasirhombicuboctahedron
- Quasisimple Group
- Quasithin Theorem
- Quasitruncated Cuboctahedron
- Quasitruncated Dodecadocahedron
- Quasitruncated Dodecahedron
- Quasitruncated Great Stellated Dodecahedron
- Quasitruncated Hexahedron
- Quasitruncated Small Stellated Dodecahedron
- Quasi-Unipotent Group
- Quasi-Unipotent Problem
- Quaternary
- Quaternary Tree
- Quaternion
- Quattuordecillion