Perpendicular lines are straight lines that intersect each other at right angles which is 90 degrees
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lines that all the points on it have the same head pressure and eqipotential lines are always prependicular to the stream lines .
The walls of most buildings are perpendicular to the ground they are built on.
Perpendicular lines are defined as any two lines in the same plane that intersect each other to form atleast one 90 degree angle.
Skew lines can simply be described as two lines that are not coplanar (they are not in the same plane). This means that they do not intersect and are not parallel.
On angles arms is the term used to describe lines.