quadr. Approx. ein?

φ beeinflusst 
die Matrix A

c = (0.44049382716049384, 0.486995884773662)
b = (1.2029629629629623, -0.2767901234567908)
φ = 0.8584073464102069 (slider from (-π) to 2, step 0.1)
a = CurveCartesian((((cos(φ) * x(c)) - (sin(φ) * y(c)) + x(b)) * t), (((sin(φ) * x(c)) + (cos(φ) * y(c)) + y(b)) * t), t, 0, 2)
f(t) = x(a(t))
g(t) = y(a(t))
b_1 = CurveCartesian(x(c) + f(t), y(c) + g(t), t, 0, 2)
c_1 = CurveCartesian(x(c) + f(t) + (((f(t) * cos(φ)) - (g(t) * sin(φ))) * t / 2), y(c) + g(t) + (((f(t) * sin(φ)) + (g(t) * cos(φ))) * t / 2), t, 0, 2)
l1 = Sequence(CurveCartesian[((((-sin(φ)) * s / 10) + x(b)) * t), s / 10 + (((cos(φ) * s / 10) + y(b)) * t), t, 0, 5], s, 0, 10)
l2 = Sequence(CurveCartesian[((((-sin(φ)) * s / 10) + x(b)) * t) + (((((((-sin(φ)) * s / 10) + x(b)) * t) * cos(φ)) - ((((cos(φ) * s / 10) + y(b)) * t) * sin(φ))) * t / 2), s / 10 + (((cos(φ) * s / 10) + y(b)) * t) + (((((((-sin(φ)) * s / 10) + x(b)) * t) * sin(φ)) + ((((cos(φ) * s / 10) + y(b)) * t) * cos(φ))) * t / 2), t, 0, 5], s, 0, 10)
q = true
A = Intersect(xAxis, yAxis)
u = Vector(A, b)
v = Vector(A, c)
B = (-0.8458271604938279, 0.5196543209876543)
C = (-0.5100246913580254, 0.5196543209876543)