Предмет: Математика, автор: nas1719641

вычисли площадь и периметр прямоугольника,если одна его сторона равна 7,8м,а другая-в 3 раза длинее

Ответы

Автор ответа: elenaivanchenk

периметр это сумма всех сторон
1) 7,8*3=23,4- это 2 сторона
2) 7,8+ 7,8+23,4+23,4=15,6+46,8= 62,4
площадь это длина умнож. на ширину
1) 7,8 * 23,4 = 182,52 м
периметр - 62,4
площадь -182,52

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