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"784 inches area" is meaningless. If the area is 784 SQUARE inches, then each side of the square is 28 inches long.
The area of square is : 225.0
It would be 9 inches squared.
Using Pythagoras each side is 26*sq rt of 2 which is 1352 when squared. So area of the square is 1352 square inches
A square with a side length of 3 inches has an area of 9 square inches.