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直角三角形の解き方 - 直角三角形の角度と辺が見つからない場合:三角法
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三角法の基礎:足りない辺や角度を簡単に見つける方法(SOHCAHTOA の 6 つの黄金律)
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直角三角形以外の三角形の面積を求める