Posted by jasmine on Thursday, December 8, 2011 at 11:57am.
7. Verify that parallelogram ABCD with vertices A(–5, –1), B(–9, 6), C(–1, 5), and D(3, –2) is a rhombus by showing that it is a parallelogram with perpendicular diagonals.

geometry  Reiny, Thursday, December 8, 2011 at 12:02pm
easy,
after making sketch, show that the slopes of opposite sides are equal.
Then draw the diagonals and find their slopes
show that the slope of one diagonal is the opposite reciprocal of the slope of the other.
Be careful in your slope calculations with the subtraction of all those negative numbers
I will do one slope
slope AB = (6(1))/(9  (5)) = 7/4 or 7/4

geometry  bob, Saturday, January 19, 2013 at 8:18pm
do ur own homework

geometry  CTree, Wednesday, January 4, 2017 at 1:07pm
what she needs is the formula...(that is helping not doing the work)

geometry  CTree, Wednesday, January 4, 2017 at 1:09pm
(y2y1)/(x2x1)
that is the formula
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