Nothing.
A cubic metre is a measure of volume in 3 dimensional space. A square metre is a measure of area in 2 dimensional space. The two measure different things and it makes no sense to try and convert from one to the other.
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A 28 meter square is 28 times 28 meters or 784 square meters. If it is one tenth of a meter (10 cm) deep, it has a volume of 78.4 cubic metersIf you mean 28 square meters (like a pool 4 meters by 7 meters) then the volume one tenth of a meter deep is 2.8 cubic meters.
Seven cubic meters is equal to 9.156 cubic yards. Seven cubic meters is also equal to 275.2 cubic feet.
49 square feet = 4.55225 square meters.
9 yards * 7 yards * 11 yards = 63 square yards * 11 yards = 693 cubic yards, which is about 530 cubic meters.
35 square meters.