A vector rotation in math is done on a coordinate plane.
2D vectors can be rotated using the cross and dot product.
3D vectors are rotated using matrix based quaternion math.
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It means a rotation of pi radians (180 degrees).
The answer depends on the centre of rotation. A rotation cannot be described without specifying the centre of rotation.
Size remains constant in reflection and rotation.
A rotation turns a shape through an angle at a fixed point as for example if you turn around backwards that will be a rotation of 180 degrees.
rotation symmetry of a parallelogram Sequence