f(x) = (2 * x)
g(x) = (2 * x) + 5
k(x) = (-1 / 4 * x) + 2
l(x) = (4 * x) - 6
A = Point(l)
B = Point(k)
C = Intersect(k, l, 1)
α = Angle(B, C, A)