If they intersect at right angles which is 90 degrees then they are perpendicular lines.
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i don't know beach ball
not in euclidean geometry (I don't know about non-euclidean).
whatto line segments intersect but are not perpendicular
This is the vertex of the angle between the two line segments
A bisector cuts a line SEGMENT into two congruent line segments. A line has indefinite or infinite length.