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Area of each block = 450 mm x 225 mm = 0.45 m x 0.225 m = 0.10125 m2 Area to be covere = 170 m2 So, minimum number of blocks required = 170/0.10125 = 1679.01 = 1680. However, this assumes that there is virtuall no wastage and, in real life, you should allow 5-7% extra.
10.7639104 square feet
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1 ha = 10.000 m2
40cm2 into m2