Pedal Line
Mark a point 
on a side of a Triangle and draw the perpendiculars from the point to the two other sides. The linebetween the feet of these two perpendiculars is called the pedal line.
- Bishop's Inequality
- Bishops Problem
- Bislit Cube
- Bispherical Coordinates
- Bitangent
- Bit Complexity
- Bivariate Distribution
- Bivector
- Biweight
- Blackman Function
- Black-Scholes Theory
- Black Spleenwort Fern
- Blancmange Function
- Blaschke Conjecture
- Blaschke's Theorem
- Blecksmith-Brillhart-Gerst Theorem
- Blichfeldt's Lemma
- Blichfeldt's Theorem
- BLM/Ho Polynomial
- Bloch Constant
- Bloch-Landau Constant
- Block
- Block Design
- Block Growth
- Block Matrix