Circumference = 2*pi*r = 125.66 metres
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The radius of a circle whose circumference is 40pi is 20 units.
If the circumference of a circle is 62.8 meters the diameter is: 20 meters.
If the circumference is 20 the radius is 3.18
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)
Circumference is 2 x pi x r = 3.14 x 2 x 20 = 3.14 x 40 ='125.6 cms