Γωνία περιστροφής

Α = (0.58, 0.64)
Β = (2.1, 1.28)
Γ = (3.02, 0.02)
πολύγ1, γ, α_1, β = Polygon(Α, Β, Γ)
Δ = (6, 0)
α = 0 rad (slider from 0*° to 6.283185307179586, step 0.017453292519943295)
Α' = Rotate(Α, -α, Δ)
Β' = Rotate(Β, -α, Δ)
Γ' = Rotate(Γ, -α, Δ)
πολύγ1', γ', α', β' = Polygon(Α', Β', Γ')
a = Segment(Γ, Δ)
b = Segment(Δ, Γ')
δ = Angle(Γ', Δ, Γ)