Dimensions of a Matrix

• When counting matrices, you must count row X column.
• If a matrix has the same amount of rows as it does columns, then it is a square matrix/
• If a matrix has zeros with ones going down diagonally, it is an identity matrix.

This matrix has one row and three columns. Its dimensions are 1 X 3.

This matrix has three rows and two columns. Its dimensions are 3 X 2.

This matrix has three rows and three columns. It is a square matrix and also an identity matrix. Its dimensions are 3 X 3.

This matrix has three rows and three columns. It is a square matrix. Its dimensions are 3 X 3.