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## Main Question or Discussion Point

As I understand it, there is no length contraction in the direction perpendicular to the motion being described. So if I were to observe a circle moving along a line (not rostating) and I were to measure the radius in te direction parallel to the motion, I would observe a contracted radius, and therefore calculate a smaller circumference. But if I were to measure the radius in the direction perpendicular to motion, I would observe the inertial radius and therefore the inertial circumference. Does this mean that to calculate the circumference of a moving circle, I would need to treat it as an ellipse?