SOLUTION: How many 1/2 inch square tiles to cover a ball 9 inches in diameter? Thanks I can't find my formula book and I am 79 years old. (retired aerospace engineer)

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Question 152571: How many 1/2 inch square tiles to cover a ball 9 inches in diameter?
Thanks I can't find my formula book and I am 79 years old. (retired aerospace engineer)
Found 2 solutions by scott8148, Earlsdon:
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
4(pi)r^2 is the surface area of a sphere

4(pi)(4.5)^2=254.469 (approx)

(1/2 in)^2=.25 in^2

254.5/.25=1018

Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
The surface area of a sphere with diameter D is given by: S+=+pi%2AD%5E2