Question

define the triangular matrix​

Answer 1

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$\bf\large\underline\green{Triangular\: Matrix:-}$ A square matrix is called a triangular matrix if it is an upper triangular or a lower triangular matrix.

$\bf\large\underline\green{Note:-}$The diagonal, scalar, unit and null matrices are also triangular matrices

Answer 2

a square matrix is upper triangular if all its entries below the main diagonal are zero. Example of a 2 × 2 upper triangular matrix: A square matrix with elements sij = 0 for j > i is termed lower triangular matrix.