H_o

P_o

Hilfslinien

Ziehe an P, 
dann an N.

Dandelinsche Kugel für Parabel

Ha 2012

m_1 = 4.000000000000001
O = (0, 0)
α_1 = 0.5235987755982988 rad
M: (0, -m_1)
B_1 = Rotate(M, α_1, O)
α = Angle(M, O, B_1)
a = Line(O, B_1)
b = Mirror(a, yAxis)
c = OrthogonalLine(M, a)
C = Intersect(a, c)
ko = Circle(M, C)
r = Segment(M, C)
m = Segment(O, M)
d = Line(M, xAxis)
D = Point(d)
E_1 = Rotate(D, -α_1, M)
β_2 = Angle(E_1, M, D)
e = Line(M, E_1)
F, G = Intersect(ko, e)
f = Segment(M, F)
E = OrthogonalLine(F, f)
B = Point(b)
h = OrthogonalLine(B, b)
K_1 = Intersect(E, yAxis)
L = Mirror(B, yAxis)
A = Mirror(C, yAxis)
bko = Segment(A, C)
p = Segment(B, L)
q = Segment(M, K_1)
i = Line(A, C)
H = Intersect(i, E)
j = Segment(A, B)
P_1 = Intersect(E, p)
k = Line(P_1, O)
J_1 = Intersect(k, i)
l = Segment(J_1, P_1)
n = Segment(P_1, F)
P = Point(E)
g = OrthogonalLine(P, q)
s = Line(O, P)
N = Point(g)
t = Line(O, N)
Q = Intersect(t, i)
a_1 = Segment(Q, N)
J = Intersect(s, i)
o = false
K = Intersect(b, g)
S = Intersect(a, g)
Vieleck1, k_1, s_1, c_1, a_2 = Polygon(K, S, C, A)
b_1 = Line(F, i)