Предмет: Математика, автор: Rom1ch

Площадь прямоугольника равна площади квадрата со стороной 1,8 см. Одна из сторон прямоугольника равна 1,2 см. Вычислите периметр прямоугольника.

Ответы

Автор ответа: Аноним

1)1,8 * 1,8 = 3,24 (см) - площадь.
2)3,24 : 1,2 = 2,7(см)-вторая сторона.
3) ( 1,2 + 2,7) * 2 = 7,8(см)
Ответ:периметр 7,8 см.

Удачи!:)

etopolina: а почему во 2 -ом действии мы раздилили

Автор ответа: DmitriyIgonin1998

Sкв=а^2=1,8^2=3,24
Sкв=Sпр=3,24
Sпр=ab
3,24=1,2b
b=2,7
Pпр=(a+b)*2=(1,2+2,7)*2=3,9*2=7,8

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