We can also represent any point (x, y) in a plane by a matrix (column or row) as
x
y
 
 
   (or [x, y]) For example point P(0, 1) as a matrix representation may be given as
0
P
1
 
=  
 
 or [0 1] Observe that in this way we can also express the vertices of a closed rectilinear
figure in the form of a matrix For example, consider a quadrilateral ABCD with vertices
A (1, 0), B (3, 2), C (1, 3), D (–1, 2)