None. Because 'yars' is a linear measure. You need a 'Cubic' measure.
You gave two dimensions a length and a width. However, you also need to know the depth, in order to give you the volume of concrete needed in 'cubic feet'.
To convert 'cubic feet' to 'cubic yards' divde cubic feet by '27'.
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You will need 1.23 cubic yards.
Most will hold 10 cubic yards. Some local codes will force them to run 8 or less because of the weight.
Total surface area... 276 square yards.
8 yards square
16 hectares is 191358 sq yards. It is not possible to give the length and breadth since the area could be, for example, 1 yard by 191358 yards or 10 yards by 19135.8 yards or 100 yards by 1913.58 yards or 2 yards by 95697 yards