Parabolas

A way to trace out them: the points equidistant from a point (the focus) and a straight line (the directrix)

    Ellipses

	PF1+PF2 = 4.9

    Hyperbolas

A way to trace out them:  PF1−PF2 = 1

 
All conics can be described as follows:
 
a·x² + b·x·y + c·y² + d·x + e·y + f = 0

b²−4ac = 0	b²−4ac < 0	b²−4ac > 0
x²+y²−2yx+2y+2x+1 = 0,	x²−xy+y²/3 = 1,	x²−4xy+y²/3 = 1

		or so: ρ = 1/(1+e·cos(θ)