Volumes of Revolution Cross Sections

CrazedOutBoy
Sat, 01 May 2010 22:58:02 +0000

I’ll help out a little bit too. When you do revolution and you don’t know whether to use dy or dx, just look at what axis you’re revolving the function around. If it’s x = something, use dy. If it’s y = something, use dx. Don’t get mixed up on the ‘if it’s revolved around the y axis, use dx.’ Y axis is x = 0, so you have to use dy. Same with the x axis, use dx for that.