Lines that never intersect are parallel.
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Coplanar lines that do not intersect are parallel. Non-coplanar lines that do not intersect are called skew lines.
Two coplanar lines that never intersect are called called parallel lines.
When two lines intersect to form a right angle they are called perpendicular.
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The lines that intersect to Form A right triangle are called Perpendicular Lines; the resulting meeting point of these two lines is called the vertex of the angle.