Respostas

2014-07-16T20:44:37-03:00
A:4.9 x 4.9 = 24.01
P:4x5= 20
2014-07-16T20:45:32-03:00
2(b+h) = 20

b + h = 10
      b = 10 - h

A = 24 m²

bh = 24

h.(10-h) = 24

-h² + 10.h - 24 = 0 (-1)

h² - 10.h + 24 = 0

Δ = 100 - 96
Δ = 4

h = (10 +/- 2)/2
h' = 12/2 = 6 m
h" = 8/2 = 4 m

b = 10 - h
b = 10 - 6
b = 4 m

b = 10 - h
b = 10 - 4
b = 6

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Logo as medidas são 6 m e 4 m