Yes
Area of a circle = pi*radius2
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Area of a circle equals pi r2 Therefore the radius of a circle equals the square root of (area divided by pi).
Area equals pi times the radius squared.
A circle with a radius of 5.1 inches has an area of 81.71 square inches.
Area of a circle equals pi (~3.14) multiplied by the radius squared. So to find the area of that circle your equation is (3.14)(3)^2 which equals approximately 27.
Half the square root of the square radius equals the circle radius.