1. Choosing Disk or Shell Method Unit 6 Day 9

2. Do Now Give the following formulas for a horizontal axis of rotation. Disk method Washer method Shell method

3. Ex. 1 Decide whether it is more convenient to use the disk/washer method or the shell method to find the volume of the solid of revolution. Explain. (Do not actually find the volume).

4. Ex. 2 Decide whether it is more convenient to use the disk/washer method or the shell method to find the volume of the solid of revolution. Explain. (Do not actually find the volume).

5. Ex. 3 Decide whether it is more convenient to use the disk/washer method or the shell method to find the volume of the solid of revolution. Explain. (Do not actually find the volume).

6. 1. 1.For the shell method, the representative rectangle is drawn parallel to the axis of revolution. 2. 2.For the disk method, revolving around the horizontal axis requires an f(y). 3. 3.For the shell method, when subtracting to find the height of the representative rectangle, it doesn't matter in what order you do the subtraction. Closure: True or False?