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Precalculus 7 Online
OpenStudy (anonymous):

how do i find the angle a line segment PQ makes with the x-axis if it is plotted in 3 dimensions? P(1,1,4) and Q(0,6,-3)

OpenStudy (e.mccormick):

Take a look at this: http://www.wikihow.com/Find-the-Angle-Between-Two-Vectors One of your vectors is the x axis. That help, or do you need more?

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