This preview may not appear the same on the actual version of the PPT slides. Some formats may change due to font and size settings available on the audience's device. To get/buy a soft copy, please send a request to queenyedda@gmail.com Inclusions of the file attachment: * Fonts used * Soft copy of the WHOLE ppt slides with effects ACCEPTING COMMISSIONED POWERPOINT SLIDES ACCEPTING COMMISSIONED POWERPOINT SLIDES ACCEPTING COMMISSIONED POWERPOINT SLIDES EMAIL queenyedda@gmail.com - - - - - - - - - - - - - - Definition of Angles - Parts of Angles - Protractor - Kinds of Angles - Measuring Angles The Assignment on the last slide is for them to have a background on the next lesson.

1. AnglesGrade 7 – Mathematics

2. • An angle is defined as the amount of turn
between two rays that share a common
end point.
• Angles are measured in degrees
Angles 90°

3. Let’s identify the
parts of an
angle!
T X

4. Let’s identify the
parts of an
angle!
V E R T E X

5. Let’s identify the
parts of an
angle!
R

6. Let’s identify the
parts of an
angle!
A R M S

7. Let’s identify the
parts of an
angle!
D G

8. Let’s identify the
parts of an
angle!
D E G R E E S

9. the common
point where
the two rays
meet
vertex
the rays that
make up the
angle
arms
the measure
of the size of
an angle
degrees

10. Naming Angles
1
One way is to use
the ∠ symbol followed
by three letters.
The first and third
letters indicate points
on the two arms.
The letter in the middle
is the vertex.
∠ __ __
__
A B C
∠ __ __
__
C B A

11. Naming Angles
using the ∠ symbol
only with the vertex
point.
The angle would
be called ∠B.
by using the ∠ symbol
followed by the letter
or number between
the angle.
This would be ∠1.
1
∠ABC
∠CBA
∠CAB
∠BCA
∠B ∠1

12. 4 5
?
?
?
?
?
?
?
?
?

13. Kinds of Angles
acute
angle
less than 90°
obtuse
angle
more than 90°
less than 180°
right
angle
exactly to 90°

14. Kinds of Angles
reflex
angle
more than 180°
Full
rotation
exactly 360°
straight
angle
exactly to 180°

15. acute right
obtuse straight

16. Protractor
A tool that is used to measure angles.
outer
scale
inner
scale
center

17. Measuring Angles
Place the center of the protractor on the vertex B
A
B C

18. Measuring Angles
Place the center of the protractor on the vertex B
A
B C
Adjust the 0° baseline of the protractor so that it lines
up with line BC

19. Measuring Angles
Place the center of the protractor on the vertex B
A
B C
Adjust the 0° baseline of the protractor so that it lines
up with line BC
Since the angle is acute and the 0° line or baseline was used
from the right, you will take the reading from the inner scale
30°

20. Measuring Angles

21. Measuring Angles

22. Measuring Angles

23. Measuring Angles

24. Measuring Angles

25. Let’s Review!
These are angles whose
measure is exactly 90°
acute obtuse
right straight

26. Let’s Review!
(90° + 45°) is what kind
of angle?
acute obtuse
right straight

27. Let’s Review!
It is the sum of
two right angles.
acute obtuse
right straight

28. Let’s Review!
These are the rays that
make up the angle.
degrees arms
points vertex

29. Let’s Review!
It is the common point
where the two rays meet.
degrees arms
points vertex

30. Let’s Review!
It is the measure of
the size of an angle
degrees arms
points vertex

31. Let’s Review!
If the points A and B are the arms,
what is the name of the angle if
point C is the vertex?
∠ ABC ∠ CBA
∠ BAC ∠ ACB

32. Let’s Review!
How many ways
can you name the
angles on this
picture?
9 10
12 13

33. Let’s work together!
It is the only animal
that have fingerprints.
5 3 2 14
A – 20°
D – 60°
E – 35°
G – 110°
K – 155°
L – 120°
N – 160°
O – 145°
P – 25°

34. Let’s work together!
It is the only animal
that have fingerprints.
A L AOK
5 3 2 14
A – 20°
D – 60°
E – 35°
G – 110°
K – 155°
L – 120°
N – 160°
O – 145°
P – 25°

35. What is the measure of the angle?
20°

36. 20°
What is the measure of the angle?

37. 145°
What is the measure of the angle?

38. What is the measure of the angle?
120°

39. What is the measure of the angle?
155°

40. Assignment
Search for the following terms and
formulas. Write your answers on your
notebook.
1. Time
2. A.M.
3. P.M.