# Types of Lines

Types of lines is the sub topic of the topic basic Geometry. In which Line is a geometrical object that is straight,endless and thin.It is continuous and we can increase the length, straight or curved.It will not have thickness; the trace of proceeding points.Below you can find the different variety of lines.

Name of the lineDescription
1.Parallel lines If two lines are always at the same distance apart and will not meet. This kinds of lines are known as parallel lines.
2.Perpendicular lines A line is perpendicular to another if it meets or crosses it at right angle (90°)
3.Concurrent lines If two or more lines passing through the same point then the lines are called concurrent lines.

## Types of lines: Classifications

### 1. Parallel lines

If two lines are always at the same distance apart and will not meet, then they are known as parallel lines.The length of two lines should not be same. The perpendicular distance between those two lines must be same anywhere.

Practical example: Railway track

We are using the symbol || to represent parallel line. In the above picture the first line (l1) is shorter than the second line (l2) but both the lines are in same direction. The perpendicular distance between the first and second line will be same always.They should not meet anywhere.So that these kinds of lines re called as parallel lines.If two lines are parallel then these will have the following properties.

Properties of Parallel Lines

• If two lines are intersected by a transversal,pair of acute angles are equal in measure, pairs of obtuse angles are also equal in measure,and any acute angle is supplementary to any obtuse angle.

If line m is || to line n, then:

• Alternate interior angles will be equal in measure.
• Corresponding angles will be equal in measure.
• The sum of degree measures of two interior angles on the same side of the transversal is 180.
• Also, the sum of the degree measures by any acute angle and any obtuse angle will be 180.

• ### 2. Perpendicular Line

Lines which are at right angles (90°) to each other.

Here the line CD is intersecting the line AB at 90 degree so we can say the line CD is perpendicular to the line AB.

### 3.Concurrent Lines

when 3 or more than three lines meet at the same point.

Here all the four are intersecting at the point P.These lines are known as concurrent lines.