<PRE><B>Question 796343</B>
&lt;font face=&quot;Times New Roman&quot; size=&quot;+2&quot;&gt;


Three non-collinear points can be grouped so as to form three pairs.  Calculate the slopes of the lines that contain each pair of points.  If any pair of such lines are perpendicualar, then the triangle is right.  Otherwise not.  Intersecting lines are parallel if and only if their slopes are negative reciprocals.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
&lt;font face=&quot;Math1&quot; size=&quot;+2&quot;&gt;Egw to Beta kai to Sigma&lt;/font&gt;
My calculator said it, I believe it, that settles it
&lt;div style=&quot;text-align:center&quot;&gt;&lt;a href=&quot;http://outcampaign.org/&quot; target=&quot;_blank&quot;&gt;&lt;img src=&quot;http://cdn.cloudfiles.mosso.com/c116811/scarlet_A.png&quot; border=&quot;0&quot; alt=&quot;The Out Campaign: Scarlet Letter of Atheism&quot; width=&quot;143&quot; height=&quot;122&quot; /&gt;&lt;/a&gt;&lt;/div&gt;
&lt;/font&gt;</PRE>