Bodová konstrukce paraboly
Author: Radka Hamříková

p = 1.4 (slider from 0 to 5, step 0.1)
V = (0, 0)
F = Point(Circle[V, p])
a = Segment(V, F)
o = Line(V, F)
D = Mirror(F, V)
d = OrthogonalLine(D, o)
c = Parabola(F, d)
O = Point(Circle[F, p])
b = Segment(F, O)
e = Circle(O, (2 * p))
A = Point(d)
B = Point(Circle[A, p + p / 4])
C = Point(d)
E = Point(Circle[C, p + p / 2])