1.5 meters
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It is 800 ft that is greater because 250 yd = 750 ft
12 ft x 10 ft x .333 ft (4 in) = 39.96 cu ft. You need enough concrete for 40 cubic ft.
Assuming that's 30 ft X 30 ft X 6 inches, you will need 20 cubic yards
800 feet is greater.
340sq feet.