Sqrt 28 = sqrt 4 x sqrt 7 = 2 root7 = 5.2915 in each side
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Its area is 49 square inches.
"784 inches area" is meaningless. If the area is 784 SQUARE inches, then each side of the square is 28 inches long.
615.75 square inches.
If the area of a circle is about 28 square inches the diameter of the circle is: about 6 inches (5.971).
The diameter is 5.97 inches.