Thus, if 
1
3
1
A
2
4
1
3
5
6
−




=
−





 Then the elements of the diagonal of A are 1, 4, 6 Rationalised 2023-24
 40
MATHEMATICS
(iv)
Diagonal matrix
A square matrix B = [bij] m × m is said to be a diagonal matrix if all its non
diagonal elements are zero, that is a matrix B = [bij] m × m is said to be a diagonal
matrix if bij = 0, when i ≠ j For example,  A = [4], 
1
0
B
0
2
−

= 



, 
1