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2.8m=280 cm
280 × 320 = 89600 cm
40 × 40 =1600 cm
89600 : 1600 = 56 buah
3,2 m = 320 cm
280 x 320 = 89.600 cm2
40 x 40 = 1.600 cm2
banyak keramik ::::
89.600 : 1.600 = 56 keramik