Периметр равнобедренного треугольника равен 35. боковая сторона в 3 раза больше чем основание. чему равна боковая сторона? ! а)10 б)15 в)9 г)5

Пусть х - длина основания, тогда 3х - длина боковой стороны. Учитывая, что периметр треугольника равен 35 И треугольник является равнобедренным, составим уравнение:

3х+3х+х=35

7х=35

х=5 - длина основания

3×5=15 - длина боковой стороны

ответ: б)

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)по чертежу думаю все понятно там тэтрайдер.   1 расматриваем аов по теореме пифагора   находим ов=10.   2 в треугольнике овс он равнобедренный проводим высоту он она попадает на середину вс. находим он по теореме пифагора он=корень под ним 100-9 =корень из 91. находим площадь треугольника 1/2*св*он=3корня из 91. находим периметр 10+10+6=26  2 находим ов=а корей из 2. находим он = 2а2-а2/4=а корней из 7 делить на 2. площадь а2 корней из 7 делить на 4 а периметр =а(1+2 корня из 2)