It is a square decametre or 'are'.
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40 meters.
The length is 100 / 12.5 = 8 meters.
A square with a side length of 10 metres (40/4) has an area of 100 square metres.
100 square meters
The square root of 100 is 10, so the edges of the square are 10 meters in length. As there are 4 edges then the perimeter will measure 10*4 = 40 meters