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P = 6 +x
2(P +x ) < 40
2((6+x)+x) < 40
6+2x < 20
2x< 14
x< 7 cm
P(panjang) = 7+6 = 13cm
panjang = 6 cm + lebar
lebar = x cm
keliling = kurang dari 40 cm
keliling < 40
2(p+l) < 40
2(6 + x + x) < 40
2(6 + 2x) < 40
12 + 4x < 40
12 - 12 + 2x < 40 - 12
4x < 28
4x : 4 < 28 : 4
x < 7
sehingga HP = {x} = {x I x < 7}
x maksimal = 7
Panjang maximal = x + 6 = 7 + 6 = 13 cm