Volume question

Jul 2010
86
0
Im having a bit of problem with the following question:

Find the volume of the solid obtained by rotating the region bounded by the curves y=0, y= sinx, 0<=x<=pi; about the line y=-2

Im not exactly sure how to solve it with it being bounded by 3 curves
help please?
 
Jul 2010
58
27
Brazil
Sketch the situation like this:

ESQUEMA.JPG

Then use de disk method to find the volume. Try to imagine you looking at the top of the solid. Write down the integral and evaluate.