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maka06
@maka06
August 2022
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4 15 В треугольнике ABC cos А = 0,4, АВ = 4, АС = 7. Найдите квадрат стороны ВС.
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shevtsovavalia
По теореме косинусов: ВС²=АВ²+АС²-2*АВ*АС*cosA=4²+7²-2*4*7*0,4=
=16+49-22,4=42,6
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=16+49-22,4=42,6