If you are asking what are perpindicular lines, they are two lines that cross to form right angles, or 90 degree angles. An example of this is a plus sign (+). The two lines forming the plus sign are perpindicular to each other.
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parallel lines are diagonal lines or increasing lines
intersecting lines divergent lines convergent lines
A rhombus has parallel lines but no perpendicular lines.
Right triangles have a set of perpendicular lines and no parallel lines.
They can be, and are, "skew". If they are not lines, they cannot be "skew lines".