Is the vector projection of B onto A, perpendicular to B? Is the angle between projAB and the vector B equal to 90 degrees? Is this always the case or no?

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter1: Vectors
Section1.2: Length And Angle: The Dot Product
Problem 2AEXP
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Is the vector projection of B onto A, perpendicular to B? Is the angle between projAB and the vector B equal to 90 degrees? Is this always the case or no? 

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