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) Now, quadrilateral ABCD in the matrix form, can be represented as
2
4
A
B
C D
1
3
1
1
X
0 2
3
2
×
−


= 



or
4 2
A 1
0
B
3
2
Y
C
1
3
D
1
2
×






=




−

Thus, matrices can be used as representation of vertices of geometrical figures in
a plane Now, let us consider some examples