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lizadonchencko
@lizadonchencko
July 2022
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В треугольние АВС АС = ВС = 16, cosА = 0,75. Найдите АВ
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bayd
По теореме косинусов
BC²=AB²+AC²-2*AC*AB*cosA
BC²=AB²+16²-2*16*AB*0,75
256=AB²+256-2*AB*16*0,75
AB=24
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Answers & Comments
BC²=AB²+AC²-2*AC*AB*cosA
BC²=AB²+16²-2*16*AB*0,75
256=AB²+256-2*AB*16*0,75
AB=24