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keliling persegi panjang = 2p + 2l
= 2(2l) + 2l
= 4l + 2l
= 6l
6l = 54
l = 54 / 6
l = 9 cm
p = 2l
p = 2(9)
p = 18 cm
luas = 18 * 9
= 162 cm²