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Lebarnya = x
P = x + 18
P + L = 72
x + 18 + x = 72
2x + 18 = 72
2x = 72 - 18
2x = 54
x = 27 cm
Lebar = 27 cm
Panjang = 27 + 18 = 45 cm
smgmbntu ya
72 cm = 2 (18 + l + l)
72 cm = 2 (18 + 2l)
72 cm = 36 + 4l
72 cm - 36 cm = 4l
36 cm = 4l
36/4 = l
9cm = l
panjang = 18 + l
= 18cm + 9cm
= 27cm