Question 408417
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Hi
A rhombus is a Quadrilateral with all sides equal in length 

D = {{{sqrt ((x1-x2)^2+(y1-y2)^2))}}}
K(2, 3), 
L(7,3)  KL = {{{sqrt(25) = 5}}} 

L(7,3), 
M(4,7)  LM ={{{sqrt( 9 + 16) = 5}}} 

M(4,7) and 
N(-1,7) MN = {{{sqrt(25) = 5}}}  

N(-1,7),
K(2, 3)  NK = {{{sqrt( 9 + 16) = 5}}}