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panjang (p) = 3/2 lebar
keliling = 2p + 2l
90 = 2.3/2 lebar + 2lebar
90 = 3 lebar + 2 lebar
90 = 5 lebar
lebarnya = 18 cm
lebar = 2/3 panjang
18 = 2/3 panjang
54 = 2panjang
panjangnya = 27 cm
luas = p.l
luas = 27.18 = 486 cm²