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См. Пошаговое объяснение
Пошаговое объяснение:
Задание
Забор имеет форму прямоугольника какова длина забора, если стороны соответствующего прямоугольника равны:
а) 7 м и 18 м
б) 9,2 м и 3 1/2 м
в) 10,45 м и 8,8
Решение
Длина забора - это его общая протяженность. Если забор имеет форму прямоугольника, то его общая протяжённость (длина) равна периметру прямоугольника. Периметр прямоугольника Р равен произведению суммы двух его сторон на 2:
P = 2 · (a + b),
где a и b - стороны прямоугольника.
а)
а = 18 м, b = 7 м,
P = 2 · (a + b) = 2 · ( 18 + 7) = 2 · 25 = 50 м
ответ: 50 м
б)
а = 9,2 м, b = 3 1/2 м = 3,5 м
P = 2 · (a + b) = 2 · (9,2 + 3,5) = 2 · 12,7 = 25,4 м
ответ: 25,4 м
в)
а = 10,45 м, b = 8,8 м
P = 2 · (a + b) = 2 · (10,45 + 8,8) = 2 · 19,25 = 38,5 м
ответ: 38,5 м