f(x) = 0.25 x^(2)
A = Point(f)
F = Point(yAxis)
a = Line(F, A)
B, C = Intersect(f, a)
O = Intersect(xAxis, yAxis)
g = Tangent(A, f)
b = Tangent(B, f)
I_1 = Intersect(g, b)
I = Intersect(g, b)
α = Angle(A, I, B)