Surface area by revolving a curve problem, help

[Waggattack]

Surface area by revolving a curve problem, help!

can someone show me how to solve for the surface area when rotating y=sqrt(4-x^2) around the x-axis from -1 < x < 1.

shows the steps please!
thanks

 

[berkeman]

can someone show me how to solve for the surface area when rotating y=sqrt(4-x^2) around the x-axis from -1 < x < 1.

shows the steps please!
thanks

Welcome to the PF. We do not do your schoolwork for you. What coordinate system do you think is best for this problem? Why? Now show us how you would try to set up the integral, and we can comment if you are having problems with the work that you post for us...