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難問 ？！ ３つの角の和 ∠α＋∠β＋∠γ＝？
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ヒポクラテスの三日月（Moon of Hippocrates）
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４つの弧に囲まれた部分の面積 ver.2
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サイクロイド曲線 (NHK for school 高校講座 数学A ２５…
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サイクロイド曲線 ver.2 （Hypocycloid）
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おうぎ形を転がすと。。。2025年度 公立入試(千葉)
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展開図が正方形になる「三角すい」2025 高専 入試問題
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国立高等専門学校 2025 入試問題
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相似 四角形に内接する半円 (２つの三角形でM字型)
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2025 大学入試共通テスト (γ-α)/(β-α)の偏角
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2025 大学入試共通テスト sin(θ+π/6)=sin2θ
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三角形の内接円
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