how can we decide that using π or 2π in applications of integrations about volume of solid questions??

Question

anonymous · Answer

well, 2pi goes for the shell method

anonymous · Answer

how can we understand to use it in a question?

anonymous · Answer

and pi i remeber goes for the disk method and washer method

anonymous · Answer

well if we had a concrete example it would be better, because for some solids we can use both methods. Can you provide an example?

anonymous · Answer

ok i know but how can i determine which type of solid ask a question??I mean that a cylinder or a disk or whatever else ?

turingtest · Answer

For me it is easier to think about the disk method, then think of the shell method as what the disk method isn't. Consider the revolution of...

anonymous · Answer

ok..thanks

turingtest · Answer

the graph$$f(x)=x^2$$about the y-axis bound on the top by y=1|dw:1325200516952:dw|this volume is probably best thought of in terms of discs...