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大数の法則
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平行四辺形の中の三角形で面積が等しいもの
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等積変形四角形
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弧の長さが等しければ円周角は等しい
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円周角は弧の長さに比例する
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接線と弦の作る角(接弦定理)
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回転四角形の頂点の軌跡
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2つの円の位置関係
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二等辺三角形と正三角形の関係
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円周角の定理の証明
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円周角の定理1
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相似の位置
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