Which coordinate system should be selected to determine the position of the tractor in the field?

To choose a coordinate system for determining the position of a physical body, you must first determine in which directions this body can move (degree of freedom). In this case, the tractor on the field can move in two directions: back and forth and right and left, that is, it has two degrees of free. Therefore, to determine the position of the tractor on the field, a two-dimensional coordinate system will suffice (correct answer: two-dimensional).

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