Due to symmetry reasons, the previous theorem is valid in any direction in K, not only along the x-axis:

(Theorem) If a rod is moving lengthwise at velocity w relative to K, its rest length contracts by a factor of √1 – w2   / c2    when viewed from K.

The theorem is valid for any uniformly moving rigid objects. The contraction happens along the direction of movement, while there is no change in size along perpendicular directions.

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