A directory of useful objects found on the web for teaching Maths.
http://www.freemathhelp.com/distance-formula.html
Lesson
This math lesson covers the distance formula for a two-dimensional geometric plane. The process to calculate the distance between two points is demonstrated and diagrammed, and a three-dimensional expansion of the formula is provided.
9 February 2013 Edit: 23 February 2014
User submitted, thanks to dukeblue219
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