B = Point(xAxis)
C = (2, 5)
A = (2, 0)
α = Angle(B, A, C)
O = Midpoint(C, B)
D = (5, 5)
poly1, a, b, d, c = Polygon(A, B, D, C)
e = Segment(C, B)
f = Segment(D, A)