if 12 is the perimeter...
then it would be 12 meters of brick walkway
if 12 is the area...
and by 12m squared you mean as the area...
then it depends on the dimmensions of the flowerbed. It could be 1 by 12 which would give you 26 m, or it could be 3 by 4 which would give you 14m
if 12 is the area, and the flower bed is square...
you would need to find the square root of 12, and multiply it by 4
sorry i couldn't be of more help, but your question is a little confusing, but these are the 3 scenerios i guessed you could mean
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15x20=300 3x3=9 300-9=291 square meters
9.144 meters x 6.096 meters = 55.741824 square meters
The difference between 50 meters and 5 meters is 50 meters - 5 meters, which equals 45 meters.
7.62 meters times 3.3528 meters = 25.548336 square meters.
24 square meters