Предмет: Математика, автор: svetlaantonova

Найди периметр прямоугольника сторона которого равна 7 см,а площадь 21 кв.см.

Ответы

Автор ответа: Sonderling14
2
1) 21:7 = 3 см - вторая сторона ( S=a*b    a=S:b)
2) (7+3)*2=20 см - периметр ( P=(a+b)*2 )

ОТВЕТ : 20 СМ
svetlaantonova: Спасибочки:)
Sonderling14: ПОЖАЛУЙСТА
Автор ответа: sonjuniap19gu6
0
найдем сначала вторую сторону для этого разделим 21 на 7 и получим 3
теперь найдем периметр
7+7+3+3=20
Ответ:20
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