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.
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
An angle that measures 900 is called a right angle. A right angle makes a quarter revolutions.
An angle that measures 1800 is called a straight angle. A straight angle makes a half revolution.
An angle that measures less than 900 is called an acute angle.
An angle that measures more than 900 and less than 1800 is called an obtuse angle.
An angle that measures more than 1800 is called a reflex angle.
Two lines that meet each other at a single point are called intersecting 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.