https://www.geogebra.org/haftendorn
Haftendorn, Buch (Springer):
Kurven erkunden und verstehen
Kap 7.7.2: Aufgabe 7.8 a) S.217
www.kurven-erkunden-und-verstehen.de

Ha 2016

r = 2 (slider from -5 to 5, step 1)
O = Intersect(yAxis, xAxis)
i = OrthogonalLine(O, xAxis)
M: (r, 0)
c = Circle(M, O)
Q = Point(c)
A: ((2 * r), 0)
f = Line(A, Q)
Vieleck1, c_1, b, b' = Polygon(O, A, Q)
g = Line(O, Q)
B = Intersect(f, i)
h = OrthogonalLine(B, yAxis)
P = Intersect(h, g)
Ortslinie1 = Locus(P, Q)
α = Angle(A, O, B)
β = Angle(O, B, P)
a = false
d: y^(2) = ((2 * r) * x)
F = Focus(d)