# CBSE Class 12-science Answered

**What is meant by orders of matrices What is Triangular matrix**

Asked by Jogy Jacob | 08 Mar, 2013, 10:09: PM

Expert Answer

Order of a matrix gives the number of rows and columns present in the matrix.

For example,

A matrix is said to be a column matrix if it has only one column.

A = [a

_{ij}]_{m x 1}is a column matrix of order m x 1A matrix is said to be a row matrix if it has only one row.

B = [b

_{ij}]_{1 x n}is a row matrix of order 1 x n.A triangular matrix is a special kind of square matrix. A square matrix is called lower triangular if all the entries above the main diagonal are zero. A square matrix is called upper triangular if all the entries below the main diagonal are zero. A triangular matrix is one that is either lower triangular or upper triangular.

Answered by | 09 Mar, 2013, 09:50: PM

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