Select subject
Line and Angles

# Line and Angles

The distance between the endpoints of a line segment is the length of the line segment.

Lesson Demo

#### Length of a line segment:

The distance between the endpoints of a line segment is the length of the line segment. The length of a line segment can be measured accurately using a ruler and a divider.

#### Complete angle:

An angle of measure 3600 is called a complete angle.
One quadrant  =  ¼ (Complete angle)
= 1/4 x 3600900 =
Two quadrants = 1/2 (Complete angle) = 1/2 x 3600 = 1800
(Complete angle) = 3/4 x 3600 = 2700

#### Right angle:

An angle that measures 900 is called a right angle. A right angle makes a quarter revolutions.

#### Straight angle:

An angle that measures 1800 is called a straight angle. A straight angle makes a half revolution.

#### Acute angle:

An angle that measures less than 900 is called an acute angle.

#### Obtuse angle:

An angle that measures more than 900 and less than 1800 is called an obtuse angle.

#### Reflex angle:

An angle that measures more than 1800 is called a reflex angle.

#### Intersecting lines:

Two lines that meet each other at a single point are called intersecting lines.

#### Perpendicular lines:

Two lines that intersect each other at right angles are said to be perpendicular to each other.

#### Bisector of a line segment:

A bisector of a line segment is a line that divides the line segment into two equal parts.

#### Perpendicular bisector of a line segment:

The perpendicular line that divides a line segment into two equal parts is called the perpendicular bisector of the line segment.