How many sq ft cover whit yard in 1/2 of concrete
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Assuming you mean 18 inch by 18 inch, you will need 133 and 1/3 tiles.
3
1 foot = 12 inch3 feet 6 inch = (3 x 12 + 6 ) inch = 42 inch
1 inch = 25.4 mm 3 inch = 3 x 25.4 mm
An inch equals 2.54 cm. Hence in 3 inches, there are 7.62 cm.