AAA Theorem
Specifying three Angles 
, 
, and 
does not uniquely define a Triangle, but any twoTriangles with the same Angles are Similar. Specifying two Anglesof a Triangle automatically gives the third since the sum of Angles in a Triangle sums to180° (
Radians), i.e.,
See also AAS Theorem, ASA Theorem, ASS Theorem, SAS Theorem, SSS Theorem,Triangle
- Leudesdorf Theorem
- Level Curve
- Level Set
- Level Surface
- Leviathan Number
- Levi-Civita Density
- Levi-Civita Symbol
- Levi-Civita Tensor
- Levine-O'Sullivan Greedy Algorithm
- Levine-O'Sullivan Sequence
- Lew k-gram
- Lexicographic Order
- Lexis Ratio
- Lexis Trials
- L-Function
- Lg
- L'Hospital's Cubic
- L'Hospital's Rule
- L'Huilier's Theorem
- Liar's Paradox
- Lichnerowicz Conditions
- Lichnerowicz Formula
- Lichnerowicz-Weitzenbock Formula
- Lichtenfels Surface
- Lie Algebra