Contact Triangle
The Triangle formed by the points of intersection of a Triangle 
's Incircle with . This is thePedal Triangle of with the Incenter as the Pedal Point (c.f., Tangential Triangle). Thecontact triangle and Tangential Triangle are perspective from the Gergonne Point.
References
Oldknow, A. ``The Euler-Gergonne-Soddy Triangle of a Triangle.'' Amer. Math. Monthly 103, 319-329, 1996.
- Letter-Value Display
- 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