0.19635 square inches.
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The diameter of a 28-square inch circle is: 5.971 inches.
Assuming a circle with a diameter of one half inch, A = 2Ï€r so the area in square inches would be half of pi or about 1.57 in2.
The area of a 7-inch circle is: 38.48 square inches.
The area of a 26-inch diameter circle is 530.93 square inches.
Area of a circle = pi*radius2