The perimeter of the square is 40 inches
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That is not a square, it is a rectangle and it has a perimeter of 36 inches.
4*2.5 = a perimeter of 10 inches
for area you times the two numbers and for perimeter you add the numbers
Approximately 10 inches.
A square has 4 sides of equal length; the perimeter of a square is 4 times the length of the side: 4 x 10 in = 40 in