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任意角三等分
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任意角三等分. 北縣林口國中 李政憲. 長方形紙張. 摺出任意角. 張開還原. 沿長邊對摺. 還原. 沿折線再對折. 還原. 將圖示兩點. 分別折至兩摺線上. 還原. 摺出兩點的連線. 折出角平分線. 完成. 還原. 三等份任意角. 證明：已知. θ. θ. 證明：線鏡射. θ. θ. 證明：線鏡射. θ. θ. 證明：邊等長. θ. θ. 三角度相同. θ. θ. θ. 參考資料：.
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任意角三等分
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