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l = x
p = 2x
k p. panjang = 2p + 2l
54 = 2.2x + 2x
54 = 4x +2x
54 = 6x
9 = x
54cm²=2(2x+x)
54 cm²= 4x+2x
6x=54cm
x=54/6
x=9