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(2) B=45°、C=75°なのでA=60°
よって 2R = 2/sin60° ↔︎ R = 2/√3
(3) a/sinA = b/sinB になるので
4/sin45° = b/sin60° ↔︎ b = 2√6
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ありがとうございます...！
理解出来た上にきちんと解けました🥲🥲