The document explains the different types of angles: acute (less than 90 degrees), right (exactly 90 degrees), obtuse (more than 90 but less than 180 degrees), straight (exactly 180 degrees), and reflex (more than 180 but less than 360 degrees). It includes group activities for measuring angles and quizzes to reinforce the concepts. The document concludes with a prompt for questions.

1. Angles
Introduction to

2. What Is an Angle?
An angle is the space between two straight lines
which come together at a common endpoint
called a vertex.

3. An acute angle is the smallest
angle there is. It measures less
than 90 degrees.
Acute Angle

4. A right angle is an angle that
measures exactly 90 degrees,
forming a square corner.
Right Angle

5. An obtuse angle is an angle that
measures more than 90 degrees
but less than 180 degrees.
Obtuse Angle

6. A straight angle is an angle that
measures exactly 180 degrees,
forming a straight line.
Straight
Angle

7. A reflex angle is an angle that
measures more than 180
degrees but less than 360
degrees.
Reflex Angle

8. GROUP ACTIVITY
Measure all the angles of your
assigned figure.

9. GROUP 1

10. GROUP 2

11. GROUP 3

12. GROUP 4

13. GROUP 5

14. Time for a
Quiz!

15. A right angle
A
An acute angle
B
An obtuse angle
C
Which Angle Is This?

16. An acute angle
B

17. An acute angle
A
A reflex angle
B
A right angle
C
Which Angle Is This?

18. A right angle
C

19. An acute angle
A
An obtuse angle
B
A right angle
C
Which Angle Is This?

20. An acute angle
A

21. A straight angle
A
A reflex angle
B
A right angle
C
Which Angle Is This?

22. A straight angle
A

23. Thank You!
Any Questions?