Answer
True
Work Step by Step
From Theorem 7.5.3, a real $n \times n$ matrix $A$ is an orthogonal matrix if and only if the row (or column) vectors of $A$ form an orthonormal set of vectors.
Differential Equations and Linear Algebra (4th Edition)
by Goode, Stephen W.; Annin, Scott A.
Published by
Pearson
ISBN 10:
0-32196-467-5
ISBN 13:
978-0-32196-467-0
Chapter 7 - Eigenvalues and Eigenvectors - 7.5 Orthogonal Diagonalization and Quadratic Forms - True-False Review - Page 473: g
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