Предмет: Математика, автор: ІркаВампірка

Срочно!!!!!!!!!!!!!!довжиа прямокутника на5,2 см більа за ширину е периметр дорівнює 25,6см.Знайдіть площу квадрата сторона якого дорівнює довжині прямокутника?

Ответы

Автор ответа: natatkchyk

длина прямоугольника =х+5,2см
ширина=х
Р=2*(а+в)
25,6=2*(х+х+5,2)
12,8=2х+5,2
2х=12,8-5,2
х=7,6/2
х=3,8
длина =3,8+5,2=9
значит площадь квадрата =9*9=81см2

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