Предмет: Математика, автор: lido3

в треугольнике две стороны равны 5см и 21см,а угол между ними -60°.Найти третью сторону треугольника

Ответы

Автор ответа: Katyaa098

Теорема cos(косинуса)
a^2=b^2+c^-2*b*c*cosα
a^2=5^2+21^2-2*5*21*cos60
a^2=25+441-210*(1/2)
a^2=361
a=19

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