﹙5.4×1/3÷1/200﹚×﹙5.4×2/3÷1/200﹚÷2=﹙1.8×200﹚×﹙3.6×200﹚÷2=360×720÷2=259200÷2=129600﹙㎝²﹚=12.96﹙㎡﹚5.4×2/3=3.6cm 5.4-3.6=1.8cm3.6÷1/200=720cm=7.2m1.8÷1/200=360cm=3.6m7.2*3.6÷2=12.96平方米