1. Summary

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
Three quadrants=3/4
(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.

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