hey.. i sat for 12 too..
can we discus that here??
and how did u do the last qestion?
Last number, you must be meaning the volume of shaded region when it is rotated 360
o.
Well, it was simple.
1. You needed to find volume under the line.
2.Find volume under the curve.
Both should be in terms of pie. Then you subtract volume under curve from the volume under line to obtain the required solution