This document defines and provides examples of different types of angles: - Acute angles are less than 90 degrees. - Right angles are exactly 90 degrees. - Obtuse angles are greater than 90 degrees but less than 180 degrees. - Reflex angles are greater than 180 degrees. - Examples of finding different angles in the classroom and words are provided to help students identify each type of angle.

1. Line and
Angles

2. Learning Outcomes
• Recognise angles.
• Recognise, compare and classify angles
as acute, right, obtuse and reflex.

3. What is a LINE?
• A straight path in a plane that goes on
forever in opposite directions
Example:
• line AB or line BA

4. What is a POINT?
• An exact location in space, usually
represented by a dot
Example:
point A

6. ANGLE

7. LINE

8. ACUTE ANGLE
an angle that is less than 90°

9. By using protactor

10. RIGHT ANGLE
 an angle that is 90° exactly

11. By using protactor

12. OBTUSE ANGLE
an angle that is greater than 90° but less
than 180°

13. By using protactor

14. REFLEX ANGLE
an angle that is greater than 180°

15. By using protactor
http://www.amblesideprimary.com/ambleweb/mentalmaths/protractor.html

16. Ask student to look around them and ask them to
describe something about the type of angle

17. Activity 1:
Hunt for some angles in your
classroom
Student will take a drawing paper and draw The
Angle Finder:
right
acute obtuse

18. Place the left side of your Put the corner of your
angle along this side straw on the dot

19. You need:
Straw
What to do:
1) Use the straw to match the angle in your
classroom. When you find an angle, bend
the straw to match it.

20. • Hold the bent straw up to the Angle
Finder. It will tell you which kind of angle
you have found.
• As you find each type of angle, list on the
Angle Chart.
• Then straighten out the straw and start
again

21. Angle Chart
RIGHT ACUTE OBTUSE
Corner of my notebook Space between my Clock hands at 10:30
fingers

22. Activity 2:
Angles from A to Z
Angles are hiding everywhere
even in the words you’re reading
now.
When two straight lines meet,
they make an angle.

23. What to do:
1) Student will be given a handout that have
work.
2) Ask them to take look at the letter in the
word given.
3) Circle each angle they see in the lettets.
Label whether it is right, acute or obtuse
angle.

24. Example:
MATH

25. TIME

27. An acute angle is greater than 90⁰.
A) FALSE
B) TRUE

28. An obtuse angle is greater than 90⁰ but less
than 180 ⁰.
A) TRUE
B) FALSE

29. A straight angle measure 180⁰.
A) TRUE
B) FALSE

30. A right angle does not measure 90 ⁰.
A) TRUE
B) FALSE

31. WRONG!!!!
THE
END

32. CONGRATULATIO
N!!!!!
GOOD JOB
!!!
THE
END