National Council of Teachers of Mathematics
The Math Forum: Ellipsoid, Torus, Spherical Polygon Formulas
Curious as to what an ellipsoid is? Dr. Math provides a picture and a brief description. This site also has information pertaining to a torus, and spherical polygon.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Volume of an Ellipsoid
Dr. Math, in a reply to a student question, discusses how to calculate the volume of an ellipsoid.
Wolfram Research
Wolfram Math World: Ellipsoid
This site from Math World begins with a picture of an ellipsoid and then gives cartesian and parametric equations for the surface. The site gives much more information for the ellipsoid, including special ellipsoids, a surface area...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Calculating Surface Area of an Ellipsoid
Dr. Math, in a reply to a student question, discusses how to calculate the surface area of an ellipsoid.
Wikimedia
Wikipedia: Alexis Clairaut
This site from Wikipedia provides a concise biography on mathematician Alexis Claude Clairaut (1713-1765 CE) gives an overview of his accomplishments. Links are also provided for additional information.