25 pi sqm
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The area of a circle equals pi times the radius squared (A = pi*radius2) where pi is 3.1416 So the radius is the square root of the area divided by 3.1416
x2 +y2 = R2 =16 = radius 2 R = 4
The radius of a circle is half its diameter (the measure of the circle from one side across to the other).
the radius is from the center of the circle to the edge so that's how you find the radius.
Diameter is two times the radius, in our case the radius is 10.4 inches, Can you now find the diameter. I am sure you can, good luck!