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YanaRomashkova
@YanaRomashkova
August 2022
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В треугольнике ABC AC=BC, AB=28, cosA=0,7. Найдите AC.
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Alfrol
Пусть AB=BC=X, тогда по теореме косинусов получаем:
28^2+x^2-2*0.7*x*28=x^2
28^2=2*0.7*28*x
x=20(см)
Ответ:AC=x=20(см)
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Answers & Comments
28^2+x^2-2*0.7*x*28=x^2
28^2=2*0.7*28*x
x=20(см)
Ответ:AC=x=20(см)