line that goes east and a line that goes north
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Two lines but they can't be parallel. It would be better to say two rays that share the same endpoint form an angle. However, two intersecting lines form angles also. Two rays can form a 180 degree angle if they share the same endpoint and point in exactly the opposite directions. Two perpendicular lines can form a right or 90 degree angle.
Two lines that form a 90 degree angle are considered perpendicular.
bisectors
50. It is always two times the rotation.
A line is orthogonal to another if it is at 90° to it. You can call lines that intersect at 90° orthogonallines.You can also say that the lines form a right angle.