+

+

+

A = (-2.82, 5.52)
B = (-4.4, 0.42)
C = (0.56, 0.5)
D = (1.02, 3.74)
poly1, a, b, c, d = Polygon(A, B, C, D)
α = Angle(B, A, D)
β = Angle(A, D, C)
γ = Angle(D, C, B)
δ = Angle(C, B, A)
angle1 = 0 rad (slider from 0 to 180*°, step 1*°)
E = Midpoint(c)
A' = Rotate(A, angle1, E)
B' = Rotate(B, angle1, E)
C' = Rotate(C, angle1, E)
D' = Rotate(D, angle1, E)
poly1', a', b', c', d' = Polygon(A', B', C', D')
ζ = Angle(B', A', D')
η = Angle(A', D', C')
θ = Angle(D', C', B')
ι = Angle(C', B', A')
angle2 = 0 rad (slider from 0 to 180*°, step 1*°)
F = Midpoint(b')
A'' = Rotate(A', angle2, F)
B'' = Rotate(B', angle2, F)
C'' = Rotate(C', angle2, F)
D'' = Rotate(D', angle2, F)
poly1'', a'', b'', c'', d'' = Polygon(A'', B'', C'', D'')
λ = Angle(D'', C'', B'')
μ = Angle(A'', D'', C'')
ν = Angle(B'', A'', D'')
ξ = Angle(C'', B'', A'')
angle3 = 0 rad (slider from 0 to 180*°, step 1*°)
G = Midpoint(a'')
A''' = Rotate(A'', angle3, G)
B''' = Rotate(B'', angle3, G)
C''' = Rotate(C'', angle3, G)
D''' = Rotate(D'', angle3, G)
poly1''', a''', b''', c''', d''' = Polygon(A''', B''', C''', D''')
ε = Angle(B''', A''', D''')
κ = Angle(A''', D''', C''')
ο = Angle(D''', C''', B''')
ρ = Angle(C''', B''', A''')
texte1: "" + α + ""
texte2: "" + β + ""
texte3: "" + γ + ""
texte4: "" + δ + ""
σ: α + β + γ + δ
texte5: "= " + σ + ""