When do we say that a matrix is orthogonal?

A matrix is an orthogonal matrix if

where A^T is transpose of A.

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A square matrix A is said to be orthogonal if (A^T)A =I,'T' stands for transpose and 'I' stands for identity.

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any square matrix A is said to be a orthogonal matrix if..

AA' = A'A = I(identity matrix)

or we can say A^T = A^-1

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