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Convert 600 mm into feet and use the formula: area = pi*radius2
2.2
circumference = diameter x pi area = radius squared times pi divide circ with pi gives you the diameter diameter/2 gives you radius radius times itself times pi gives you the area get the units right and you're done.
Diameter is half of the radius. Times it by 2.
If you want the area of a circle, and you know the diameter, then: A = pi*r^2, where r is the radius, and is 1/2 the diameter, so pi*(diameter/2)^2 = (pi/4)*(diameter)^2. If you want square inches, then make sure you have the diameter measurement in inches, first.