A = Point(xAxis)
B = Point(yAxis)
C = Point(xAxis)
D = Point(yAxis)
a = Segment(B, C)
b = Segment(C, D)
c = Segment(A, D)
d = Segment(A, B)
Vieleck1, b_1, a_1, e = Polygon(A, (0.0, 0.0), B)
α_1 = Angle(A, (0.0, 0.0), B)
α = Angle(B, A, D)
β = Angle(C, B, A)
γ = Angle(D, C, B)
δ = Angle(A, D, C)
Text1: "α = " + α
Text2: "β = " + β
Text3: "γ = " + γ
Text4: "δ = " + δ