How to find the angle of a vector?

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Answer # 1 #

Ensure the angle is in the correct unit (degrees or radians) as required.

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Answer # 2 #

In 3D, angle between two vectors A and B: cos θ = (A·B)/(|A||B|), then θ = arccos of the value. Dot product and magnitude are used.

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Answer # 3 #

For a 2D vector (x, y), angle θ with x-axis: θ = arctan(y/x). Use a calculator or programming function like atan2(y, x) for accurate results.

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