Respostas

2014-07-26T20:31:04-03:00
Perimetro do retangulo = 2( c +l) = 26
area do retangulo = c x l = 40
2(c + l) = 26
c + l = 13
c = 13 - l

c x l = 40
(13 - l) x l = 40
13l - l² = 40
-l² + 13l - 40 = 0
Δ = b² - 4. a . c
Δ =13² - 4 .-1. -40
Δ = 9
-13 +/-√9 / -2
-13 + 3 / -2 = 5
-13 - 3 / -2 = 8
comprimento = 8km   largura = 5km
2014-07-27T01:58:58-03:00