In Euclidean and Newtonian mathematics, it is a set of points where any three points define a straight angle, that is an angle whose angular measurement is 180°.
Outside Euclidean mathematics, such as curved space defined by Einstein, things break down, but if you are dealing with things on Earth, Newtonian mathematics is sufficient. â–
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The trajectory of the motion is a straight line.
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A straight horizontal line is a line that goes sideways, often represented by the equation y=a where a is any real number.
Linear means a straight line.
It is a straight line that touches the circle.