Parallel lines two lines l and m in the same plane are said to be parallel lines if they do not intersect when produced indefinitely in either direction and we write `l |\|` m which is read as l is parallel to m.

Parallel lines two lines 1 and m in the same plane are said to be parallel lines if they do not intersect when produced indefinitely in either direction and we write l|m which is read as 1 is parallel to m.

In fig. if lines l and m are parallel lines then x=

If m parallel lines in plane are intersected by a family of n parallel lines, find the number of parallelogram formed.

If m parallel lines in a plane are intersected by a family of n parallel lines, find the number of parallelograms formed.

prove that two lines m and n be parallel to the same given line are parallel to each other.

For what value of x will the lines l and m be parallel to each other ?

For what value of x will the lines l and m be parallel to each other ?

Parallel rays two rays are parallel if the corresponding lines determined by them are parallel.In other words two rays in the same plane are parallel if they do not intersect each other even if extended indefinitely beyond their initial points.