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2(3x) + 2(6x) = 72
6x + 12x =72
18x = 72
x = 72/18
x = 4
AD = BC = 3x = 3(4) = 12 cm
AB = DC = 6x = 6(4) = 24 cm
Luas ABCD = AB × DE
= 24 × 6
= 144 cm2
Luas = BC × DF
144 = 12 × DF
DF = 144/ 12
DF = 12 cm