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- Thread starter andrewkg
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Is it about the definition of the angle between two vectors?

Or is it about finding the angle between two vectors given their components?

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SteamKing

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jtbell

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$$A_x B_x + A_y B_y + A_z B_z = |\vec A||\vec B| \cos \theta$$

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Never mind I misread something earlier. Making my question very illogical. Sorry. Thanks though.

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Nugatory

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I know how to find the angle between vectors. I know theta is ~110 just don't know where the ~110 deg comes from. By this I mean how is that angle defined. I just do not know how angle between vectors in a 3d plane are defined.

Conceptually, you put the two vectors together tail to tail as jtbell says above. The two vectors will lie in a single two-dimensional plane (which may be slanted/tilting); in that two-dimensional plane you can use a protractor to find the angle just as you would if you had started with vectors in only two dimensions.

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