Question 822645
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Rhombus.svg/200px-Rhombus.svg.png ">
The coordinates of the vertices of parallelogram ABCD are A(–1, –3), B(7, 2), C(5, 8), and D(–3, 3). 
A(–1, –3) 
C( 5, 8)   m = 11/6
B(7, 2)
D(–3, 3)   m = -1/10 
Diagonals AC is not perpendicular BD, ABCD is not a rhombus
{{{drawing(300,300,   -10,10,-10,10,  
 grid(1),
circle(-1, -3,0.3),
circle(-3, 4,0.3),
circle(7, 2,0.3),
circle(5, 8,0.3),
line(-1,-3,5,8),
line(-3,4,7,2),
graph( 300, 300, -10,10,-10,10,0))}}}