Equidistant Point
Click and drag the focus (red
dot) or directrix (red line) to
change the shape of the
parabola.
 
Drag the green dot to see the
distances from any point on the
parabola to the focus and to the
directrix.
Location of focus: 
Position: 
Instruction37 Equation of directrix:  (0,5) y = -5 Distance to focus: Distance to directrix: (0,0) 5 5