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<blockquote data-quote="smartcooky" data-source="post: 724358" data-attributes="member: 20605"><p>A rugby ball is an "prolate spheroid"</p><p></p><p>A spheroid, or ellipsoid of revolution is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters.</p><p></p><p><img src="http://upload.wikimedia.org/wikipedia/commons/8/88/ProlateSpheroid.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>If the ellipse is rotated about its major axis, the result is a prolate (elongated) spheroid, like an American football or rugby ball. </p><p></p><p><img src="http://upload.wikimedia.org/wikipedia/commons/b/b5/OblateSpheroid.PNG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>If the ellipse is rotated about its minor axis, the result is an oblate (flattened) spheroid, like a lentil. If the generating ellipse is a circle, the result is a sphere. All of the giant planets plus Mars, Earth and Venus are oblate spheroids</p></blockquote><p></p>
[QUOTE="smartcooky, post: 724358, member: 20605"] A rugby ball is an "prolate spheroid" A spheroid, or ellipsoid of revolution is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters. [img]http://upload.wikimedia.org/wikipedia/commons/8/88/ProlateSpheroid.png[/img] If the ellipse is rotated about its major axis, the result is a prolate (elongated) spheroid, like an American football or rugby ball. [IMG]http://upload.wikimedia.org/wikipedia/commons/b/b5/OblateSpheroid.PNG[/IMG] If the ellipse is rotated about its minor axis, the result is an oblate (flattened) spheroid, like a lentil. If the generating ellipse is a circle, the result is a sphere. All of the giant planets plus Mars, Earth and Venus are oblate spheroids [/QUOTE]
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