If you're talking about a square, 7. Please be more specific next time.
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For a square, the area is the length of a side squared and the perimeter is 4 times the length. If the area is 49, then the length of a side is 7. The perimeter is then 4 times 7, or 28.
49
7
The area is equal to length x width. Both length and with of a square are the same. The only number multiplied by itself that equals an area of 49 is 7.
If its area is 49 square meters then the lenght of 1 side is 7 meters