Предмет: Математика, автор: Елизабета111

треугольнике одна сторона 11 см , вторая 3 см . Найти третью сторону ,если периметр равен 21сантиметру

Ответы

Автор ответа: Аноним

1

21-11-3=7 см-третья сторона

Автор ответа: Duxov

1

P=AB+BC+AC
21=11+3+AC
AC=21-11-3
AC=7 см

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