226.865 squared inches
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A circle with a radius of 11 inches has an area of 380.13 square inches.
A circle with a radius of 18 inches has an area of 1,017.88 square inches.
Area = pi*r2 where r is the radius. So Area = 28 sq inches gives radius = 2.985 inches and then, diameter = 2*radius = 5.971 inches.
A circle with a radius of 3 inches has an area of 28.27 square inches.
The radius of a circle with an area of 706.50 square inches is: 15 inches.