No 30 yaa tolong,, makasih

panjang karpet = 18 m = 1.800 cm
lebar karpet = 11 m = 1.100 cm

di sisakan 150 cm tanpa karpet disekelilingnya sehingga :

panjang karpet = 1.800 cm - ( 2 x 150cm)= 1.800 cm - 300 cm = 1.500cm
lebar karpet = 1.100 cm - (2× 150cm ) = 1.100 cm - 300cm = 800cm

luas karpet = p x l = 1.500cm x 800cm = 1.200.000 cm2 = 120 m2