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今回のテーマは「余弦定理」。三角形の一つの角の大きさと３つの辺の長さの関係を、コサインで表したものです。前回学んだ正弦定理と同様に、いろんな問題を解くときに活躍しますが…どんな場面で使えるかの見極めが大切です。ミニコーナーでは、ピザの六等分に三角比を応用します。出演：アイク　ぬわら、酒井　蒼澄、藤本　ばんび、湯浅　弘一

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