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kseniyalol7
@kseniyalol7
July 2022
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Решите треугольник CDE, если угол C= 60градусов, CD=8дм, CE=5дм.
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nasthinatasama
По теореме косинусов
DE²=CD²+CE²-2*CD*CE*cosC
DE²=64+25-2*8*5*1/2=89-40=49
DE=7
6 votes
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Answers & Comments
DE²=CD²+CE²-2*CD*CE*cosC
DE²=64+25-2*8*5*1/2=89-40=49
DE=7