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lebar = x
panjang = 3x
keliling = 2(p+l)
64 = 2(3x+x)
64 = 2(4x)
64 = 8x
x = 64/8
x = 8
panjang = 3x = 3 x 8 = 24 cm
lebar = x = 8 cm
luas = p x l
luas = 24 x 8
luas = 192 cm²