Clearer then you Don.

Diameter times side(square) = area of circle = pr^2

The only thing left to do is multiply by 4 (4pr^2).

So D * S * 4 = 4pr^2 = surface area of sphere. A very easy and pretty accurate formula to use much like 22/7 for the real Pi value(yes Don Pi is real).

Now where is Pi in the length of the Diameter?

Where is Pi in the length of the Side of a square?

Where is Pi in the value of 4?

Lobo-hotei
lobo

Treat the earth well, It was not given to you by your parents, It was loaned to you by your children.
Native American Proverb