20m/mn = 4/n
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20m x 20m = 400 metres2
Of course: 25m2 - 20m + 4 = (5m - 2)2.
Yes waffle can be provided for 20m x 20m span but it becomes uneconomical
5m * 20m = 100 m2 = 1076.4 sq ft (approx)
Speed = Distance/time = 20m/3.18s =6.29ms-1