document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=149643>Question 149643</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I'm trying to prove the distance formula for the distance between two points in 3 space.  I know in 2-dimensional space how to go about this, but how do I expand it to 3-dimensions?  Do I need to go through the Pythagorean theorem twice?  Any nudge in the right direction would be most appreciated. </SPAN>\n" );
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