Ok...so I'm not sure what to do with this problem at all. If someone could point me in the right direction it would be greatly appreciated.

"Let

*f* and

*g* be the functions given by the equations $\displaystyle f(x) = \sqrt{x})$ and $\displaystyle g(x)=1-\cos(\frac{\pi x}{2}) $. Let

*A* be the shaded region in the first quadrant enclosed by the graphs of

*f* and

*g*, and let

*B* be the shaded region in the first quadrant enclosed by the graph of

*f*, the y-axis and the line y = 1.

(a) Find the area of

*A*.

(b) Find the volume of the solid generated when

*A* is rotated about the x-axis.

(c) Find the volume of the solid generated when

*B* is rotated about the y-axis."

So I have a vague idea for (a)...rectangular approximation method? As for (b) and (c)...no idea...