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p + l = 70
p : l = 4 : 3
p = 4/7.70 = 40 cm
l = 3/7.70 = 30 cm
L = pl
= 40.30
= 1200 cm²
p : l = 4 : 3
panjang = 4x
lebar = 3x
2(4x + 3x) = 140
2(7x) = 140
14x = 140
x = 140 / 14 = 10
maka panjang = 4x = 4 . 10 = 40 cm
lebar = 3x = 3 . 10 = 30 cm
luas persegipanjang = panjang . lebar = 40 . 30 = 1200 cm²