Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
Drexel University or The Math Forum.



RE: [apcalculus] ellipsoid
Posted:
May 25, 2012 10:26 AM


Kevin,
Okay. I think you mean that if you rotate a semicircle around its diameter you create a sphere, and the method of disks will give the volume of that sphere. If you rotate half an ellipse around one of its axes you produce an ellipsoid and the method of disks will give the volume of this ellipsoid. However, these are special cases. These produce ellipsoids one of whose crosssections is a circle. The volume of these ellipsoids will be (4/3)pi a b^2 or (4/3) pi a^2 b. The general ellipsoid is not a soid of revolution.
Alan
Alan Lipp 19 Payson Avenue Easthampton, MA 01026 4135293278
The Williston Northampton School inspires students to live with passion, purpose, and integrity.
Original Message From: Kevin Regardie [mailto:kregardie@sandi.net] Sent: Friday, May 25, 2012 9:50 AM To: AP Calculus Subject: Re:[apcalculus] ellipsoid
He's making the connection because when you integrate pi*r^2 using disk method you get volume so in turn he says the integral of pi*ab should give the volume of an ellipsoid. This is his reasoning. I appreciate the responses so far, but no one mentioned the INTEGRAL of area as it relates to volume. Thank you. ==== Course related websites: http://apcentral.collegeboard.com/calculusab http://apcentral.collegeboard.com/calculusbc  To search the list archives for previous posts go to http://lyris.collegeboard.com/read/?forum=apcalculus To unsubscribe click here: http://lyris.collegeboard.com/read/my_forums/ To change your subscription address or other settings click here: http://lyris.collegeboard.com/read/my_account/edit
==== Course related websites: http://apcentral.collegeboard.com/calculusab http://apcentral.collegeboard.com/calculusbc  To search the list archives for previous posts go to http://lyris.collegeboard.com/read/?forum=apcalculus To unsubscribe click here: http://lyris.collegeboard.com/read/my_forums/ To change your subscription address or other settings click here: http://lyris.collegeboard.com/read/my_account/edit



