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2(P +l) = Keliling
2( 5+l + l) < 70
5 + 2l < 70/2
2l < 35-5
2L < 30
L < 15...> lebar
P = 5 + L
P = 5 + 15
P < 20 cm.... Panjang
K < 70
2(p + l) < 70
2((l + 5) + l) < 70
2(l + 5 + l) < 70
2(2l + 5) < 70
4l + 10 < 70
4l < 70 - 10
4l < 60
l < 15
Himpunan Penyelesaian = {14, 13, 12, ...}
l = 14 cm
p = l + 5
= 14 + 5
= 19 cm
NB ~> Itu panjang dan lebar yang maksimal.