Question

find the surface area of the band of the sphere generated by revolving the arc of the circle
x^2 + y^2 = r^2 lying above the interval [-a,a], a, r.

Answer 1

First off, you should draw a picture and show me what you can do and I'll help you along.

Answer 2

im completely not knowledgeable about this one...pls help out

Answer 3

That can't stop you from drawing a picture though.

Answer 4

okay, but i doubt i can draw here
how do i do that?

Answer 5

Right below the text box to post there's a little blue draw button. =D

Answer 6

Press ze button got it.