J2: Magnitude & Direction of a Vector

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From the DfE Mathematics AS and A-Level Content (LINK):

The Magnitude of a 3D Vector

J2-09 Vectors: Finding the Magnitude / Length of a 3D vector

J2-10 Vectors: Examples of Finding the Magnitude of 3D Vectors

The Angle between two 3D Vectors

J2-11 Vectors: Finding the Angle between Two 3D Vectors Method 1

J2-12 Vectors: Finding the Angle between Two 3D Vectors Method 2