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Szangaku feladat: kör és két érintője

저자:Száldobágyi Zsigmond, Sundararajan
주제:원
http://www.cut-the-knot.org/Curriculum/Geometry/AngleBetweenTangentAndChord.shtml http://en.wikipedia.org/wiki/Sangaku https://math.osu.edu/sites/math.osu.edu/files/Sangaku.pdf

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