Homework Help: GeOmEtRy!!!

Posted by VeRoNiCa C. on Monday, January 2, 2012 at 1:09am.

Determine whether a figure with the given vertices is a parallelogram. use the method indicated. P(-5,1) S(-2,2) F(-1,-3) T(2,-2); Slope Formula

GeOmEtRy!!! - Steve, Monday, January 2, 2012 at 4:55am
You need to make sure that the vertices form two pairs of lines, each pair having the same slope.

I'll assume the vertices are labeled PSFT in order. So, we want PS and FT to be parallel, and SF and TP to be parallel.

PS has slope (2-1)/(-2+5) = 1/3
FT has slope (-2+3)/(2+1) = 1/3

You can check the other pair.

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