MaplePrimes - answers and comments on Question, Shell and disc method , please help

Do you think it is shell, or disc?

Carl Love — Mon, 28 Jan 2013 19:59:19 Z

Which method do you think will work better for this problem: the shell method, or the disc method?

Shell or disc method is better !........ How to solve?

Safa — Mon, 28 Jan 2013 23:34:12 Z

Shell method is easier to solve for this problem to find the volume !

Correct. Now what is radius?

Carl Love — Tue, 29 Jan 2013 00:57:41 Z

Correct, the shell method is easier in this case.

Give Maple the following command to plot the region in question:

plots:-implicitplot([y= x^2+4*x+6, x=1, y=2, x=3], x= 0..4, y= 0..30);

Suppose you took just one arbitrary point (x,y) inside the region and rotated that point in the manner suggested by the problem. What would be the radius of the circle made by that rotation?