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5 : 3
5x : 3x
keliling = 2(p+l)
96 = 2(5x+3x)
96 = 2(8x)
96 = 16x
x = 96/16
x = 6
panjang = 5x = 5 x 6 = 30 cm
lebar = 3x = 3 x 6 = 18 cm
luas = p x l
luas = 30 x 18
luas = 540 cm²