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AlexAnDrrr
@AlexAnDrrr
July 2022
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В треугольнике АBC угол B равен 90 градусов , sin A=2√2/3 , AB-3. Найти AC
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shevtsovavalia
SinA=2√2/3⇒cos²A=1-(2√2/3)²=1-8/9=1/9⇒cosA=1/3
cosA=AB/AC⇒AC=AB/cosA=3/(1/3)=9
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cosA=AB/AC⇒AC=AB/cosA=3/(1/3)=9