<PRE><B>Question 534599</B>
&lt;font face=&quot;Times New Roman&quot; size=&quot;+2&quot;&gt;


It depends.  Are you allowed to use the properties of a rectangle that says opposite sides are congruent, or do you have to prove it as part of this proof?


Whichever, once you are able to state that the opposite sides of a rectangle are congruent, then you can establish that two triangles, namely ABD and BCD are congruent by SAS (you know that right angles are equal).  Then the two diagonals are congruent by CPCT.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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>