△αβγノ辺 αβ、αγ ヲ辺トスル正三角形α′αβ、β′αγ ヲ作リ、線分α′γ、β′β ノ交点ヲ ωトスル。 α′ω : ωγ = β′ω :ωβ ヲ証明セヨ。 T.theodor 2022.5.5
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