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keliling = 2 (panjang + lebar)
54 = 2 ((3 + lebar) +lebar )
54 = 2 (3 + 2lebar)
54 = 6 + 4 lebar
54 - 6 = 4 lebar
48 = 4 lebar
lebar = 12
panjang = 3+ lebar
= 3 + 12
= 15
Luas = panjang x lebar
= 12 x 15
= 180 m2