Question

Calculate the ROC, dA/dD, where A is the surface area of a sphere of diameter D (the surface area of a sphere of radius r is 4(pi)(r^2 ).

Answer 1

and ROC stands for rate of change

Answer 2

\[dA/dD(4pir^2) = 8pir\]

Answer 3

I got the same answer but the the website I am on won't accept it. Possibly in terms of D? In which case it would be 4piD?

Answer 4

I'm not sure why it won't accept it...that's definitely the ROC

Answer 5

maybe it will take 8pi(d/2)? Just reaching here...

Answer 6

No luck. I'll email my professor. Thanks though.