Why this locus "lugar1" keeps indefinite?

Author:Haroldo Stenger

I'm trying to construct a parabola. I used the fact that in order for the point F to be equidistant to the line f and the point C, it must be the vertex of the isosceles triangle CFD, being D a point in f.

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Diferencia de vectores
El punto de Longchamps
Mittenpunkt o punto intermedio
Cuadrivértice ortocéntrico
H es el punto medio

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GEOGEBRA
vertice
triangulo equilatero
Área poligonos regulares
Media, varianza y desviación típica

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Binomial Distribution
Incircle or Inscribed Circle
Logarithmic Functions
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