Drawing Hyperbola

Introduction

Hyperbola has following properties.

1.The difference of distance from two foci is constant.
(PF' - PF = AA')

2.We define the coordinates as F(f, 0), F'(-f, 0), A(a, 0), A'(-a, 0) and P(x, y).
The equation of hyperbola is ........

Since PF' - PF = AA'

Applet

  • If the distance of two foci changes, what shape of hyperbola becomes? Press "+" or "-" button to consider.
  • Drag the red point to make sure
    PF - PF'=const.