My Math Forum volume of this shape

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 March 15th, 2017, 10:24 PM #1 Newbie   Joined: Mar 2017 From: Earth Posts: 6 Thanks: 0 volume of this shape Please I need help to calculate this volume: The base is an ellipse and a/b are its major/minor axes. Thanks. Last edited by skipjack; March 16th, 2017 at 10:22 PM.
 March 16th, 2017, 10:26 PM #2 Global Moderator   Joined: Dec 2006 Posts: 16,775 Thanks: 1235 Do you know how to find a volume of revolution?
 March 16th, 2017, 11:14 PM #3 Newbie   Joined: Mar 2017 From: Earth Posts: 6 Thanks: 0 @skipjack: Yes I know but in this case the base is not a circle it's an ellipse ! I found a solution if x=0 were the "axis of revolution". . But when x=a it's bit tricky....
 March 17th, 2017, 01:34 AM #4 Global Moderator   Joined: Dec 2006 Posts: 16,775 Thanks: 1235 If the volume for a circular base of radius a is V, the volume for the elliptical base is (b/a)V. The diagram seems poor, as the distance shown as 2$a$ is nothing like twice the distance shown as $a$.
 March 17th, 2017, 02:08 AM #5 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,434 Thanks: 870 Math Focus: Elementary mathematics and beyond Please post your image as an attachment.
March 17th, 2017, 02:36 AM   #6
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Ok
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 March 20th, 2017, 10:56 PM #7 Newbie   Joined: Mar 2017 From: Earth Posts: 6 Thanks: 0 up !
 April 10th, 2017, 12:54 AM #8 Newbie   Joined: Mar 2017 From: Earth Posts: 6 Thanks: 0 Up² !

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