Answer
Zero.
Work Step by Step
Since $AB$+$BC$=$AC$ (by triangle law of vector addition),
where $A,B,C$ are vertices of triangle,
Now $AC$=$-CA$
Hence, we get $AB$+$BC$+$CA$=$0$.
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 11 - Vectors and the Geometry of Space - 11.2 Exercises - Page 765: 97
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