The perimeter is the total of the sides. A square has 4 sides, in your example the sides are known so just multiply that by 4....
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12 yards (4 sides x 3 = 12)
Each side of the dog pen will be 3 yards. There are four sides. Therefore, the perimeter will be 3 x 4 = 12 yards.
The perimeter of a square with an area of 5,000 square yards is: 282.8 yards
You'd need to know one of the sides.
Perimeter = 5*8 = 40 yards