# Heeeelp me^_*

1. May 10, 2008

Challenging Problems

Develop a formula for the volume of an ellipsoid of the form
x2\a2 +y2\b2 +z2\c2 = 1

pls Help me;
I need the answer today

Last edited: May 10, 2008
2. May 10, 2008

### Defennder

You can parametrise it as follows:
http://en.wikipedia.org/wiki/Ellipsoid

Then perform a triple integration to find the volume in spherical coordinates. But the problem I got with this method is finding the limits of integration for p.

3. May 10, 2008

Thank you very much Defennnder

but I dont understand it .

4. May 10, 2008

### Pere Callahan

What exactly don't you understand? Are you familiar with using triple integrals in order to find the volume of some three-dimensional region?

5. May 10, 2008

I want to underatand
how I can develop a formula for the volume of an ellipsoid by that equation

6. May 10, 2008

### HallsofIvy

Staff Emeritus
If you have no idea how to find a volume of rotation, why are you attempting a problem like this?

7. May 10, 2008

Thank you HallsofIvy for helping me

8. May 10, 2008

So

there is no one can help me ???^-*

9. May 10, 2008

### HallsofIvy

Staff Emeritus

10. May 10, 2008

### Defennder

Does the method of volume by rotation work if all three semi-axes are unequal?

11. May 10, 2008

it must be equal

12. May 10, 2008

### Defennder

Do you mean to say all are equal? Or 2 are equal? Because if all are equal, then you have a sphere. If only 2 are equal then you only need to find the volume by rotation by integration as Halls said.

Last edited: May 10, 2008
13. May 10, 2008

I am sorry
2 are equal

14. May 10, 2008

### Defennder

15. May 10, 2008

Thank you alooooooooooooooooooooooooooooooooot

16. May 10, 2008

### vip89

ya
I am from UoS
Why??
whze this??

17. May 10, 2008

### Defennder

Um just a reminder before the two of you get warnings from forum admins. Please do all your chatting through Private Messages.

18. May 10, 2008