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panjang = 1 1/3 = 4/3 x
lebar = x
luas = p x l
192 = 4/3x.x
192 = 4/3x²
x² = 192 : 4/3
x² = 144
x = √144
= 12 cm
a.) panjang = 4/3 x 12 = 16 cm
lebar = 12 cm
b.) keliling = 2(p+l)
= 2(16+12)
= 2(28)
= 56 cm