12m2
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Perimeter = 2m Area = 0.25m2
1m and 11m 2m and 10m 3m and 9m 4m and 8m 5m and 7m. The next one, 6m and 6m, would be a square.
6m + 5n - 4m + 7n = 2m + 12n
Only if they are congruent. One of them could be the a rotation of the other - eg 4m x 6m and 6m x 4m.
2m + 13n