Quadrangle
A plane figure consisting of four points, each of which is joined to two other points by a Line Segment (where the linesegments may intersect). A quadrangle may therefore be Concave or Convex; if it is Convex, it is called aQuadrilateral.
See also Complete Quadrangle, Cyclic Quadrangle, Quadrilateral- Lehmer's Problem
- Lehmer's Theorem
- Lehmus' Theorem
- Leibniz Criterion
- Leibniz Harmonic Triangle
- Leibniz Identity
- Leibniz Integral Rule
- Leibniz Series
- Lemarié's Wavelet
- Lemma
- Lemniscate
- Lemniscate Case
- Lemniscate Constant
- Lemniscate Function
- Lemniscate Inverse Curve
- Lemniscate (Mandelbrot Set)
- Lemniscate of Bernoulli
- Lemniscate of Gerono
- Lemoine Axis
- Lemoine Circle
- Lemoine Line
- Lemoine Point
- Lemoine's Problem
- Lemon
- Length (Curve)