can be used in classroom

1. ANGLES

2. Point
An exact location on a plane is
called a point.
Line
Line
segment
Ray
A straight path on a plane,
extending in both directions
with no endpoints, is called a
line.
A part of a line that has two
endpoints and thus has a
definite length is called a line
segment.
A line segment extended
indefinitely in one direction
is called a ray.
Recap Geometrical Terms

3. If we look around us, we will see angles everywhere.
Angles In Daily Life

4. What Is An Angle ?
 Two rays that share the same
endpoint form an angle. The
point where the rays intersect
is called the vertex of the
angle. The two rays are called
the sides of the angle.

5. Fact: We can also think of an angle formed by rotating one
ray away from its initial position.

6. Angles are accurately measured in degrees.
Protractor is used to measure and draw angles.

7. There are four main types of angles.
Straight angle
Right angle Acute angle Obtuse angle
A
B C
A
B C
A
B C
B
A C
Types Of Angles

8. Right angle: An angle whose measure is 90 degrees.
Right Angle Acute Angle
Straight Angle Obtuse Angle

9. Examples Of Right Angle

10. Obtuse angle: An angle whose measure is greater than 90
degrees.
Right Angle Acute Angle
Straight Angle Obtuse Angle

11. Examples Of Obtuse Angle

12. Acute angle: An angle whose measure is less than 90
degrees.
Right Angle Acute Angle
Straight Angle Obtuse Angle

13. Examples Of Acute Angle

14. Straight angle: An angle whose measure is 180 degrees.
Right Angle Acute Angle
Straight Angle Obtuse Angle

15. Examples Of Straight Angle

16. EVALUATION

17. ENRICHMENT ACTIVITY
GAME TIME:
You will now make the
angle with your arms when
you say the angle’s name.

18. Assignment:
Copy the table below and draw two examples of
the angles for each column.
Right Angle Acute Angle Obtuse
Angle
Straight
Angle