28 inches is 28 inches long. If you would like it converted to another unit of measure, please specify.
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The hypotenuse is 29.12 inches long. (rounded)
Area = 0.5*21*28 = 294 square inches
The area is 294 square inches.
"784 inches area" is meaningless. If the area is 784 SQUARE inches, then each side of the square is 28 inches long.
28 inches. perimeter is distance around the object and a square has four equal side lengths therefore you would times 7 by 4, which is 28 inches