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96 = 2 x 12x
96 = 24x
4 = x
L = 5x4 x 7x4
= 20 x 28
= 560 m2
2(P+L) = 96
P+L = 48
7L/5 + L = 48
12L/5 = 48
L=48*5/12
L=20 m maka P= 7*20/5=28 m
sehingga luasnya adalah = 28*20 = 560 m2