A directory of useful objects found on the web for teaching Maths.
Interesting, Publisher, TANTON Mathematics, Stimulus, Video, YouTube
The derivative of the formula for the volume of a sphere gives the formule for its surface area. Is it obvious that this should be so? How about the derivative of the volume of a cube? Does it give its surface area? Well NO, and ... YES!!!
25 November 2012 Edit: 22 November 2014
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