Posted by JOY on Thursday, May 12, 2011 at 7:46am.
Calculate the surface area of a sphere whose diameter is 50 cm.

geometry  Reiny, Thursday, May 12, 2011 at 7:49am
Surface area of sphere = 4πr^2
sub in r=25

geometry  JOY, Thursday, May 12, 2011 at 8:07am
I came up with 7831.25cm is this correct

geometry  Reiny, Thursday, May 12, 2011 at 8:26am
I get 7853.98 using the π on my calculator.
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