-- Take 1/2 of the diameter. That's the 'radius' of the sphere.
-- 'Square' the radius. (Multiply it by itself.)
-- Multiply the result by 4 pi.
You now have the surface area of the sphere.
P.S.: There really isn't anything else to know about a sphere
other than its diameter.
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You divide the diameter by 2, to get the radius. Then you use the formula for the surface area of a sphere. Surface area of a sphere = 4*pi*radius^2
The surface area of a sphere with a diameter of 10 is about 314.16 units2
The surface area of a sphere with a diameter of 7cm is 153.9cm2
Surface area of a sphere = 4*pi*radius2 radius = diameter/2
This sphere's surface area is 201.06 mm2