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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