It will have a radius of 2 because 2*pi*radius is the circumference of the circle.
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The circumference of a circle with a radius of four is: 25.13
A circle with a radius of 4m has a circumference of 25.133m.
The circumference of a circle that has a radius of 3.2cm is: 20.1cm
The circumference of a circle with radius of 10cm is: 62.83 cm
The great circle has circumference 40pi and we know circumference is 2pixr so 20 is the radius of the sphere. Now use this and the formula that surface area is 4pir^2 so the surface are is 4pi(20)^2. or pi(1600)