A = Point(yAxis)
B = (7, 0)
a = Segment(A, B)
C = (3.18, 5)
b = Segment(A, C)
c = Segment(C, B)
D = Point(a)
u = Segment(A, D)
e = Line(D, c)
E = Intersect(e, b)
d = Segment(A, E)