The car and the observer

Geometry Level 3

James is facing north and has a car directly in front of him at rest facing east. The car starts moving in the direction of the east. When the car covers the first \(x\) meters, the angle of rotation of his neck is \(a\) degrees. When the car covers the next \(x\) meters, the neck rotates through an additional angle of \(b\) degrees.

Which of the following is the most precise relationship between \(a\) and \(b\)?

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