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57 = 2(9 + l)
57 = 18 + 2l
57 - 18 = 2l
39 = 2l
2l = 39
l = 39 : 2
l = 19,5 cm
L = p x l
L = 9 x 19,5
L = 175,5 cm²
maaf kalo salah