Answer
$\theta=75.5^{\circ }$
Work Step by Step
$c=\sqrt{a^2+b^2-2*a*b*\cos(C)}$
$800=\sqrt{400^2+600^2-2*400*600*\cos(180^{\circ }-\theta}$
$\theta=75.5^{\circ }$
Engineering Mechanics: Statics & Dynamics (14th Edition)
by Hibbeler, Russell C.
Published by
Pearson
ISBN 10:
0133915425
ISBN 13:
978-0-13391-542-6
Chapter 2 - Force Vectors - Section 2.3 - Vector Addition of Forces - Problems - Page 31: 23
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