Right Hyperbola
A Hyperbola for which the Asymptotes are Perpendicular. This occurs when theSemimajor and Semiminor Axes are equal. Taking 
in the equationof a Hyperbola with Semimajor Axis parallel to the x-Axis and Semiminor Axis parallel to they-Axis (i.e., vertical Directrix),
therefore gives
A special type of right hyperbola is the so-called Rectangular Hyperbola, which has equation
.See also Hyperbola, Rectangular Hyperbola- Phi Number System
- Phragmén-Lindêlöf Theorem
- Phyllotaxis
- Pi
- Piano Mover's Problem
- Picard's Existence Theorem
- Picard's Little Theorem
- Picard's Theorem
- Picard Variety
- Pick's Formula
- Pick's Theorem
- Picone's Theorem
- Piecewise Circular Curve
- Pie Cutting
- Pigeonhole Principle
- Pi Heptomino
- Pillai's Conjecture
- Pilot Vector
- Pinching Theorem
- Pinch Point
- Pine Cone Number
- Piriform
- Pisot-Vijayaraghavan Constants
- Pistol
- Pitchfork Bifurcation