sphere

[humakhan]

find the surface area of a sphere whose radius if 7 mm. round to the nearest hundredth.

made the picture.
then

V = 4/3 pi r^3
V = 4/3 pi (7)^3
V = 4/3 pi ( 343 )
V = 4/3 (1077.56628)
V = 1436.75504
V = 1436.76 mm^2

 

[tkhunny]

You really need to ask yourself why you are posting these problems. They are very much the same thing, over and over. Why do you not have confidence in your result? What is your goal with these postings on multiple websites?

Use the right formula correctly and be done with it.