geometry
posted by
JOY on
.
Calculate the surface area of a sphere whose diameter is 50 cm.

geometry 
Reiny,
Surface area of sphere = 4πr^2
sub in r=25

geometry 
JOY,
I came up with 7831.25cm is this correct

geometry 
Reiny,
I get 7853.98 using the π on my calculator.