a

A = (-14, 2)
B = (-2, 2)
C = (-8, 14)
f = Segment(A, B)
a = Segment(B, C)
l = OrthogonalLine(C, f)
D = Intersect(l, f)
α = Angle(C, D, A)
g = Segment(A, C)
h = Segment(C, D)