Предмет: Математика, автор: safinasoboleva

Периметр прямоугольника равен 170 м. Найдите вторую сторону прямоугольника, если одна из сторон равна 21 м. Помотиге

Ответы

Автор ответа: liska120803

Ответ: 64 м

Пошаговое объяснение:

Р прямоугольника = (а+b) × 2

а = 21 м

b =?

Р = 170 м

170 = (21 + b) ×2

42 + 2b= 170

2b = 170 - 42

2b = 128

b = 128 : 2

b = 64 м

Ответ: вторая сторона прямоугольника равняется 64 м.

Автор ответа: lakOR555

периметр = 2(а+б)

2*(21+б)=170

21+б=170/2

21+б=85

б=64

ответ: вторая сторона равна 64 см.

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