僕は小学校の時に三角形の面積の式が「底辺x高さ/2」であることが気に入らず、二辺の長さとその間の角度ので決まるべきだと思って、その関係式をグラフにした。教師にすごく怒られた。高校生になってそれが1/2ab*sin(theta)で正しかったことを知った。
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