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2.  Introduction
 Lines
 Type of Lines
 Example of Lines
 Angles
 Type of Angles
 Example of Angles

3.  Lines andAngles are used in our daily life
 Lines andAngles are linked with each other
 Angles have different properties depends on
how the two lines are intersecting with each
other

4.  We require minimumTwo Points to draw a
Line
 Line can be extended through both the ends
 Line withTwo End Points is called Line-
Segment
 Line with One End Point is called Ray
 Line has No thickness and has only Length
 Three or more points lie on the same line are
calledCollinear Points

5.  There are two types of Lines :
Intersecting Lines
Non-Intersecting Lines [Parallel Lines]

6. The Lines which intersect each other at a point are
called Intersecting Lines.
Intersecting lines forms angles at their intersecting
point.
Example :
a) Fig. 1 shows two line intersecting and forming an angle
b) Fig. 2 shows two lines intersecting and forming an RightAngle, these type
of lines are called Perpendicular Lines.

7. If the distance between the two lines at each point
is same, then those lines are called Parallel Lines
Example:
The distance between Points A & C and B & D are
same

8.  An Angle is formed when two rays originate
from same end point.
 The Rays making an angle are called the arms
of Angle and the end points are calledVertex
of the angle.

9.  AcuteAngle
 Obtuse Angle
 Right Angle
 Straight Angle
 Reflex Angle
 Complementary Angles
 Supplementary Angles/Linear Pair
 Adjacent Angles
 Corresponding Angles
 Vertical Opposite angles
 Alternate Interior angles
 Alternate exterior angles

10.  The measure of an angle with a measure between
0° and 90° or with less than 90° radians.
 60° 48° 87°

11.  The measure of an angle with a measure of exact
90° is called Right Angle
90°
 This angle is formed by the perpendicular
intersection of two straight lines.

12.  The measure of an angle with a measure between 90°
and 180° or with more than 90° radians.
120° 168° 95°

13.  The measure of an angle with a measure of exact
180° is called Straight Angle
180°
 It looks like a straight line. It measures 180°
(half a revolution, or two right angles)

15.  The measure of an angle with a measure between
180° and 360° or with less than 360° radians.

16.  When two angles whose sum is 90° are called
complementary Angles.
 Angle ‘a’ and Angle ‘b’ are complementary
angles

17.  When two angles whose sum is 180° are called
Supplementary Angles or Linear Pair of Angles.
 Angle ‘a’ and Angle ‘b’ are Supplementary angles
and also they form Linear Pair.

18.  AdjacentAngles are formed when two angles
have
A common vertex
A common arm
The non-common arms are on different sides of
common arm

19.  A line that intersects two lines at different
points.

20.  The Angles that occupy the same relative
position at each intersection where a straight
line crosses two others.
 If the two lines are parallel, the corresponding
angles are equal.

21.  The Angles formed when two lines intersect
each other at a point.
 The vertically opposite angles are equal.

22.  Two angles that lie between two lines on opposite
sides of the transversal are Alternate interior angles.
 If the two lines are parallel, then Alternate interior
angles are equal.

23.  Two angles that lie outside two lines on opposite
sides of the transversal are Alternate exterior
angles.
 If the two lines are parallel, then Alternate exterior
angles are equal.