[b]Input:[/b] three points <point, point, point>
Given the vertices of a triangle,
A, B, C
the tool adds the parabola, its focus, directrix and axis.
A,B,C are taken as the vertices of an Archimedes triangle, which encloses a parabola section.
The parabola passes through A and C, with AB, BC tangent to the curve.
The maths: [url]http://www.geogebratube.org/material/show/id/37814[/url]
Archimedes triangle: [url]http://www.geogebratube.org/material/show/id/35781[/url]
