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
(y2-y1)/(x2-x1)

that is the formula

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