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A right angle has no parallel lines, but it does have perpendicular lines that meet at right angles.
The answer depends on the context. Angles are related in many ways: parallel lines, angles at a point, angles in a polygon - all impose constraints on angles from which their measure may be determined.
Parallel lines do not meet and so cannot form an angle.
You pass another line through both of them and measure the angles. If the first two lines form the same angle with the third line, the first two are parallel.
right angle