Answer
Dimension: $2\times 2.$
A is a square matrix.
Work Step by Step
The dimension of $A$ is expressed as m$\times$n,
where m = number of rows, n= number of columns.
$A$ is a square matrix if m=n.
$A$ is a row matrix if m=1
$A$ is a column matrix if n=1
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Here, A has 2 rows and 2 columns.
Dimension: $2\times 2.$
A is a square matrix.
