Diagram Interpretation Workbook-1

Parallel lines : 

Parallel lines are two or more lines that are always the same distance apart and never intersect each other. In order for two lines to be parallel, they must be drawn in the same plane, a perfectly flat surface like a wall or sheet of paper. If a line l is parallel to other line m and line m is parallel to line n then line l is also parallel to line l.

 

parallel lines will always be straight lines that go on indefinitely.

 

Perpendicular line :

Perpendicular lines are lines that intersect at right angles. OR 

A line meeting another at a right angle, or 90° is said to be perpendicular to it .

If two lines are perpendicular to each other and a third line is perpendicular to eany one of them then this third line will be parallel to the other line;

 

l  ^ m and m  ^ n then l is parallel to n. 

 

Congruent lines : 

Congruent segments are simply line segments which are equal in length. By defination Congruent means equal.