Question 1121345
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*[tex \LARGE \overline{AB}] is a way to refer to the line segment with endpoints A and B.  Without the overline, *[tex \LARGE AB] refers to the <b><i>measure</i></b> of the line segment *[tex \LARGE \overline{AB}]


<b><i>Usage example:</b></i>  Let's say you have two line segments *[tex \LARGE \overline{AB}\ \ ] and *[tex \LARGE \overline{CD}] and you know that the measures of these two line segments are the same.  Then you can write *[tex \LARGE \overline{AB}\ \ ] <font face="Euclid Symbol" size="+2">@</font><font face="Times New Roman" size="+2">*[tex \LARGE \ \ \overline{CD}] which means "line segment AB is congruent to line segment CD" or you could write *[tex \LARGE AB\ =\ CD] which means "the measure of line segment AB is equal to the measure of line segment CD".  However, it would be wrong to say *[tex \LARGE \overline{AB}\ =\ \overline{CD}].  In other words the statement "the line segment AB is equal to the line segment CD" is nonsense.
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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