This depends on how you define ray. If two rays means two distinct lines radiating from a single point, then they can't be parallel in Euclidean geometry.
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yes it is
it isnt
Skew lines, parallel lines or an angle.
Two lines of a plane are said to be parallel if they do not intersect and the perpendicular distance betweem them is always same.
No, they could by parallel but not the same line.