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# Find the angle the plane makes with the vertical watch

1. Let's say the normal is (1,2,3). What vector would I use to find the angle between the plane and the vertical. (0,0,1) right?
2. (Original post by SidTheSloth1)
Let's say the normal is (1,2,3). What vector would I use to find the angle between the plane and the vertical. (0,0,1) right?
I guess so, if thats how the coordinate system in question is defined...

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Updated: May 18, 2017
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