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- 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.
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
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°
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°