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一直線上にある３点の証明例題

Author:河本順康

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正１７角形　作図　regular 17-gon
接点の作る円は内接円
目で見る立方体の2等分
直線の軌跡
６章⑥三角柱の展開図

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内心　外心　重心　垂心　オイラー線

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