1. 9.4: Finding Volume using Washer Method

2. Find the region bounded by and y=x.
Warm-up
Find the region bounded by and y=x.

3. The idea in the washer method of finding volume
Find the volume of the larger one, then the volume of the smaller one and subtract it off.

4. Simplifying the idea of the disk method
Large Volume
Small Volume
R = function furthest from the axis of rotation
r = function closest to axis of rotation

6. Find the volume of the solid that results when , x=4 and y=0 are revolved about the y-axis.