parallel lines.

parallel lines.

1. If two lines do not intersect each other they are called parallel lines.

   • lines parallel to a given line in a plane, are parallel to each other.

2. If two parallel lines are cut by a transversal then the- (1) pairs of corresponding angles are equal (2) pairs of alternate (interior as well as exterior) angles are equal

   • If a transversal cuts a pair of lines in such a way that - (!) the angles of any pair of corresponding angles are equal. or the angles of any pair of alternate (interior or exterior)are equal or, the angles of any pair of interior angles on the same side of transversal are supplementary. Then the lines are said to be PARALLEL.
     • Two lines in a same plane are perpendicular to a given line sre parallel to each other'
   • The distance between 2 parallel lines does not change. It is the same everywhere.