Question 991190
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The slopes of parallel lines are equal.  So if the line through two adjacent  vertices has a slope equal to the line through the other two vertices, then you at least have a trapezoid.  Then if the other pair of lines also have equal slopes, you have a parallelogram.


The slope formula is:


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


where *[tex \Large \left(x_1,y_1\right)] and *[tex \Large \left(x_2,y_2\right)] are the coordinates of the given points.


You have to use this formula four times.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \