Question

A square matrix is an orthogonal matrix, then find the relation between $A$and their transpose.

Answer 1

$A\times A\text{'}=I$

In a matrix A of $3\times 3$ order.

$A\text{'}$ is the transpose matrix of matrix $A.$

$A\times A\text{'}=I$

Then, matrix $A$ is an orthogonal matrix.