# Dimensions of a Matrix

## Dimensions of a Matrix

Two numbers that represent the number of rows and the number of columns in a matrix.

The term “dimensions” of a matrix is a synonym for the size of the matrix.

If a matrix has 3 rows and 5 columns, then its dimensions are 3 by 5.

### Example

The dimensions of this matrix are 3 by 5:

$$\begin{bmatrix} 2 & 5 & -2 & 7 & 10 \\ 1 & -1 & 0 & 2 & -2 \\ -3 & 0 & 3 & 5 & 12 \end{bmatrix}$$