12 yards (4 sides x 3 = 12)
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Each side of the dog pen will be 3 yards. There are four sides. Therefore, the perimeter will be 3 x 4 = 12 yards.
Perimeter of a square = 4*side = 4*3 cm = 12 cm.
10d+8=12d the origian square is 4x4
Each side measures nine inches.
24 inches