Show that for any arrow, you can pick an axis such that the projection of the arrow on that axis is zero. How many such axes are there?

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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Show that for any arrow, you
can pick an axis such that the projection of the arrow on that axis
is zero. How many such axes are there? 

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