This ppt is suitable 3rd graders.

1. Vocabulary:
 Point
 Line
 Line Segment
 Ray
 Intersecting Line
 Perpendicular Line
 Parallel Line
 Angle

2. Angles
 Two rays share the same end point for an
ANGLE. The point where the rays
intersect is called the Vertex of an angle.
The two rays are called the arms of the
angle or angle arms.
 Angles are found wherever lines and line
segments intersect.
B
C

3. Angles
 An Angle Can Be Named in Three
Different Ways by Using
– Three Letters to Name, in This Order,
Example: “Angle ABC”
 A Point on One Ray,
 The Vertex, and
 A Point on the Other Ray;
– One Letter at the Vertex; “Angle A”
– Or a Number Written Inside the Rays of the
Angle. Example: “Angle 1”
B
C
A
A
1

4. Here, are some examples:
Angle arm
Angle arm
Vertex
A
CB
The angle is called angle
ABC.
We can denote it as ABC,
⌃ ⌃
ABC , B or B.

5. Types of Angles

6. Identify the angle arms and
vertex.
S
NU
V
I
P
Angle arm US and UN
Vertex U
Angle SUN
Angle arm _____________
Vertex _______________
Angle ________________

7. Identify the angle arms and
vertex.
S
TA
T
O
P
Angle arm _____________
Vertex _______________
Angle ______________
Angle arm _____________
Vertex _______________
Angle ________________
M

8. Application for Basic Geometrical Concepts
Point S
S

9. Application for Basic Geometrical Concepts
F N
FN is a line

10. Application for Basic Geometrical Concepts
J
M
JM is a ray

11. Application for Basic Geometrical Concepts
J
XZY is an angle
ZX and ZY are angle arms
X
Y
Z

12. Application for Basic Geometrical Concepts
DO is a line segment
D O

13. Application for Basic Geometrical Concepts
Line WX intersects Line YZ at
Point O.
Z
Y
W
X
O

14. Answer Text book pages 104 -
106
Workbook pages 96-99