15 x 4 = 60 inches
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All four sides of a square are of equal length. If the 4 equal sides total 40 inches, then each side is 10 inches (40/4 inches = 10 inches).
Perimeter of a figure is the sum of its side lengths. In a square, all four sides are the same length. So, the perimeter of a square whose side length is 8.5 is 4 x 8.5 = 34.
A square has four sides of equal length so the length and width are really the same thing: 190 inches. The perimeter of the square would be 760 inches (63.3 feet).
The perimeter of an 11 inch square is 44 inches because a square as 4 equiladeral sides, meaning that they are all the same length, and perimeter adds them all together, giving a total of 44 inches.
When a square paper is folded vertically to form a rectangle with a perimeter of 39 inches, the length of the rectangle is 19.5 inches (half of the perimeter). Since the length of the rectangle is the same as the side length of the original square, the area of the original square can be calculated as the square of the side length, which is 19.5 inches squared, equaling 380.25 square inches.