This is not the construction of a parabola. You start with calculating the parabola. The construction of parabola would start with a line and a point only, than create the parabola out of it. EDIT: What I mean is the pin and string construction. I don't know if this is possible with geogebra.
![I.N "HALLUCINATION" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/n5B5q1Hwt_U/mqdefault.jpg)
This is not the construction of a parabola. You start with calculating the parabola. The construction of parabola would start with a line and a point only, than create the parabola out of it.
EDIT: What I mean is the pin and string construction. I don't know if this is possible with geogebra.