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of Contents\u83f1\u5f62\u306e\u9762\u7a4d[\u7de8\u96c6]\u83f1\u5f62\u306e\u9762\u306e\u307f\u306b\u3088\u308b\u7acb\u4f53[\u7de8\u96c6]\u30b7\u30f3\u30dc\u30eb[\u7de8\u96c6]\u95a2\u9023\u9805\u76ee[\u7de8\u96c6]\u83f1\u5f62\u306e\u9762\u7a4d[\u7de8\u96c6]\u83f1\u5f62\u306e\u9762\u7a4dS\u306f\u5e73\u884c\u56db\u8fba\u5f62\u306e\u9762\u7a4d\u306e\u516c\u5f0f S =\uff08\u5e95\u8fba\uff09\u00d7\uff08\u9ad8\u3055\uff09 \u3092\u7528\u3044\u3066\u6c42\u3081\u3066\u3082\u3088\u3044\u304c\u3001\u4ee5\u4e0b\u306e\u5f0fS=AC\u00d7BD2{displaystyle S={frac {ACtimes BD}{2}}}\u3067\u8a08\u7b97\u3059\u308b\u65b9\u6cd5\u304c\u3088\u304f\u77e5\u3089\u308c\u3066\u3044\u308b\u3002\u3053\u3053\u3067 AC \u304a\u3088\u3073 BD 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