sinθ=2S/2αβ T.theodor 2023.2.3.
α:β:γ:δ AB:BΓ:ΓΔ:ΔΑ=√γ2+β2−2γβcosθ:√β2+δ2+2βδcosθ:√α2+δ2−2αδcosθ:√α2+γ2+2αγcosθ T.theodor 2023.2.3.
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