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20m x 20m = 400 metres2
20m/mn = 4/n
20k = 20,000 The 'k' is short for 'kilo' from Latin for a 'thousand'.
Of course: 25m2 - 20m + 4 = (5m - 2)2.
Yes waffle can be provided for 20m x 20m span but it becomes uneconomical