Question 1162029
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Use the distance formula to find the measure of each of the four line segments that form the quadrilateral.  If you get the same answer all four times, the line segments are all of equal measure.


Distance formula:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \  d\ =\ sqrt{\(x_1\,-\,x_2\)^2\ +\ \(y_1\,-\,y_2\)^2}]


Use the slope formula to calculate the slope of the lines containing the four line segments.  If the quadrilateral is square, two of the lines will have slopes equal to each other, and the other two lines will also have equal slopes and these two slopes will be the negative reciprocal of the other two.  If this is not true, the quadrilateral is not a square.


Slope formula:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \  m\ =\ \frac{y_1\,-\,y_2}{x_1\,-\,x_2}]
								
								
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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