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Geometry G Name______________________________Notes: Angle Notation.
Definition: An angle is formed by two rays that share a common endpoint.
1. The point that the two rays intersect is called the ________________________.
2. The two rays are called the ______________ of the angle.
3. When naming angles, it is typical to use one or three letters. Sometimes one cannot use one letter. When using three letters, the _________________ must be the letter in the middle. Other times one uses numbers to name the angles as below.
4. Name an angle using one letter. _________
5. Name three different angles. _________, __________, _________
6. IRC can also be named in what two other ways? ,
An angle breaks up a plane into three regions: the exterior of the angle the interior of the angle points on
the angle.
7. Name the points on the interior of FAB , , ,
8. Name the points on FAB. , , ,
1
M
A
X
R
IC
K
M
A
X1 2
S
M
A R T
F
B Y
N
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Name______________________________________________________________________ Date__________________ Hour_____________
3.2 Notes – Angle MeasureGeometry G
In geometry, angles are measured in units called ____________________. The symbol is _______.
There are 4 different types of angles:Name of
angleDefinition Example
ACUTE
OBTUSE
RIGHT
STRAIGHT
Example 1:Use a protractor to measure . What kind of angle is it?
4P R
O
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Example 2:Find the measure of each angle and classify it.
a) b) c) d)
I
V
L
E D S
Example 3:Use a protractor to draw an angle having each measurement. Then classify each angle.
a) b)
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Example 4:The measure of B is 138. Solve for x.
(5x – 7)
B
Geometry G Name: ____________________________Protractor Practice Worksheet 1 Date: ____________
Goal: To measure angles using a protractor.
When using a protractor, you must use it correctly. What are the two things you need to do when using a protractor?
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1. _______________________________________________________________________________
2. _______________________________________________________________________________
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Geometry G Name: ____________________________Protractor Practice Worksheet 2 Date: ____________
Measure each angle to the nearest whole degree. You may have to extend the sides of your angle to do the measurement.
1. 2.
3. 4.
5. 6.
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Draw each angle using a Protractor.
7. 8.
9. 10.
11. 12.
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Review 3.1 – 2
1] Name the angle in 4 ways:
2] What points are in the interior, exterior or on the angle?
Interior:
Exterior:
On:
3] Use a protractor to measure each angle.
ABG = EBC =
ABF = FBC =
ABD = FBD =
4] Us a protractor to draw an angle having each of the following measurements:
50 125
90 158
10
B
AT
2
B
RI
CK
A B C
DEF
G
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Name_____________________________________________________ Date________________ Hour_______
3.3 Notes – The Angle Addition PostulateGeometry G
Suppose mKNL = 110 and mLNM = 25. What would you do to find the mKNM?
Suppose mMNK = 155 and mLNM is 30. What would you do to find the mLNK?
Angle Addition PostulateFor any ABC, if D is in the interior of ABC, then mABD + mDBC = mABC.
Draw a diagram below to show this.
VocabularyA _______ that divides an angle into ____________ angles of equal ________________
is called the ___________________________________.
11
K N
LM
K N
LM
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Geometry G Name________________________Worksheet 3.3
SHOW ALL YOUR WORK!!
1. Find m1 if mCUB = 78. 2. Find m2 if mWHI = 160.
3. mSOX = 160 m1 = x + 14 m2 = 3x – 10 Find m2
4. mBEA = 71. Find mREA.
5. mWOV = 12x. Find mLOV.
14
S
O
W
1 2 X
B U
SC
148
W
T
H
E
I
104242
A
B
E R(5x + 8)
2x
W
O
L
V76(5x + 1)
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6. mFIE = 3x, mRIE = 42, mFIR = 5x Find mFIR.
7. mHAK = 4x – 2, mKAW = 2x – 5, and mHAW = 77. Find mHAK and mKAW.
8. US bisects BUL, mBUS = 2x + 10, and mSUL = 3x – 18. Find mBUL.
9. mTRI = 3x – 5, mIRB = x + 27, and mTRB = 86. Does RI bisect TRB?
10. Find the measure of each angle.
a. mNEO = _______ b. mDES = _______
c. mDEO = _______ d. mSEO = _______
15
H
A
K
W
B
U
S
L
T
R
B
I
S E C
DN
O27
18
FE
IR
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Section 3.4 – Adjacent Angles and Linear Pairs
In the diagrams below, 1 and 2 are …
Not Adjacent Angles Adjacent Angles Not Adjacent Angles Adjacent Angles
What can you conclude about Adjacent Angles?
Adjacent Angles are angles that have a shared ____________ and the same ________________, but no interior points in common.
Try these…
Determine whether 1 and 2 are adjacent angles.
In the diagrams below, 1 and 2 are …
a linear pair a linear pair not a linear pair
What can you conclude about a Linear Pair?
Linear Pair consists of 2 angles that are ________________ and their noncommon sides are _________________ ________________.
16
1 2
E
H1 2 2
1
O
L
T
1 2 1 2 2
1
1 21
2
21
1 2
K
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3-5 – Complementary and Supplementary Angles
Two angles whose measures add up to ______ are called __________________ __________.
They can also be called a _____________ __________ if together they form a straight angle.
In the picture above, _______ and _______ are ______________________ ___________.
Two angles whose measures add up to ______ are _____________________ ___________.
In the diagram above, ______ and ______ are _____________________ ___________.
Use the figure on the right to name each of the following.
1. Name a pair of complementary angles.
2. Name a pair of supplementary angles.
3. Name a different pair of supplementary angles.
4. Name a linear pair.
Find the measure of each angle
5. 6. 7.
18
C
B
A D
50°40°
RT
L
Q
P O
N
M
56° 56°
L
E
F
A
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Find the measure of each angle in the diagram.
DAB is a right angleADE is a right angle1 = 53
m 1 = m 123 = 555 = 88
m 4 = m 9ABE = 100DEB = 80
19
A
E
D
C
B
12
65
43
87
9
1211
10
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Geometry G Name_________________________Worksheet 3.5
Supplementary and Complementary AnglesFind the measures of angles 1 through 22. Mark them in your diagram.
23) Find mDBC.
24) Find mDBC.20
571
71 2
756287
6
91181920
25
B CAx
D
8x
(4x – 20)
xA B
CD
1213
122
34 5
104
17161514 73
4211
109
70
21
22
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25) 1 and 2 are complementary. m1 = 2x + 7 and m2 = 4x – 19. Find the measure of each angle.
26) 3 and 4 are supplementary. m3 = 5x + 22 and m4 = 7x + 2. Find the measure of each angle.
27) Use the diagram on the right to name:
a) two complementary angles
b) a linear pair
c) two adjacent angles
21
A
D
CB
E
F
G
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Name_________________________________________ Date________ Hour____
3.6 – Vertical AnglesGeometry G
Vertical Angles:
THEOREM:
Examples:
1) Find x, y, and z x 51 Y z
2) Given: m4 = (2x + 5) m5 = (x +30)
Find: m6
3) Identify each pair of angles as adjacent, vertical, complementary, supplementary, and/or linear pair.
a) 1 and 2 b) 3 and 4
c) 5 and 4
d) 3 and 5
22
12
34
4 56
1
2
3 45
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4) Find x and y if CBD is congruent to FDG.
5) Find each of the following:
a) x
b) mLAT
c) mTAO
d) mPAO
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Vocabulary Words:
Complementary Angles Supplementary Angles Right AnglesAngle Bisector Linear Pair Vertical
AnglesAdjacent Angles.
ST bisects
1. In the pictures above, FOH and GOH are called _____________________________.
2. FOH and GOH are also called ____________________________________________.
3. Further, FOH and GOH are _____________________________________________.
4. In the pictures above, ACB and DCE are called ______________________________.
5. In the pictures above, JPK and KPL are called ______________________________.
6. JPK and KPL are also called ___________________________________.
7. Name the vertical angle ACD to ___________________________________.
8. What do you know about RST and TSW? ___________________________________
9. What do you call LPM? ___________________________________
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In the figure, GA and GD, and GB and GE are opposite rays.
10] Which angle forms a linear pair with ? ________
11] Do and form a linear pair? ________
12] Name two angles that are adjacent to . ________ ________
13] Name two angles that form a linear pair with . ________ ________
14] Name three angles adjacent to . ________ ________ ________
15] Do and form a linear pair? ________
16] Name the vertical angle to . _______________
17] Name another pair of vertical angles. ____________ and _______________
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Name:
Name:
1] a linear pair
2] a pair of supplementary angles
3] a pair of complementary angles
4] a pair of adjacent angles
5] a pair of vertical angles
6] two right angles
Write each pair of angles that you named above into the proper column of the table below.
Angle Relationships
Equals Equals 180 Equals 90
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A
B
C
E
FG
D
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Determine the relationship in the diagram.
Are the angles complementary or is it a right angle? The angles add to 90.
Are the angles supplementary or are they a linear pair? The angles add to 180.
Do you have an angle bisector? The two angles are congruent.
Do you have vertical angles? The two angles are congruent.
Write the equation and then solve the equation.
1. 2.
Equation: _______________________ Equation: _______________________
x = ______ x = ______
3. 4.
Equation: _______________________ Equation: _______________________
x = ______ x = ______28
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5. 6.
Equation: _______________________ Equation: _______________________
x = ______ x = ______
7. 8.
Equation: _______________________ Equation: _______________________
x = ______ x = ______
3.7 – Perpendicularity Name____________________________29
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Geometry G Date___________________ Hour_____NOTES
Perpendicularity, _____________________, and __________ measurements go together.
Definition: If lines, rays or segments form right angles, then they are perpendicular( ).
What would be the converse of the definition?
Examples:
a b
What conclusions would I be able to make if given the following:
1)
2)
30
D
E
F
a
b
A
BC
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Example 1: True or False?
1. PRN is acute.
2. 4 8
3. m5 + m6 = 90
4.
5. 7 is obtuse
Example 2:
Find x.
Example 3:
Find mDBC.
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Geometry G Name____________________________Section 2.5. Worksheet 3
Warm – Up:
1. 2.
ST bisects ,
3. 4.
& BD bisects
5.AB CDCE bisects
6.
BC bisects
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7.
8. BD bisects and
9.
10. AB CDHE bisects
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Given l p
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Determine the relationship in the diagram. Are the angles complementary or is it a right angle? The angles add to
90.Are the angles supplementary or are they a linear pair? The angles add
to 180.Do you have a angle bisector? The two angles are
congruent.Do you have vertical angles? The two angles are
congruent.
Write the equation and then solve the equation.
1. 2.
Equation: _______________________ Equation: _______________________
x = ______ x = ______
3. 4.
Equation: _______________________ Equation: _______________________
x = ______ x = ______
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Geometry G Name____________________________Section 2.5. Worksheet 6
5. 6.
Equation: _______________________ Equation: _______________________
x = ______ x = ______
Note: Picture is not drawn to scale.
7. BD bisects 8.
Equation: _______________________ Equation: _______________________
x = ______ x = ______
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9.Equation: _______________________
x = ________
10. 11.
Equation:_________________________ Equation:_________________________
x = ________ x = ________
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Geometry G Name____________________________Section 2.5. Worksheet 7
Determine the relationship in the diagram. Are the angles complementary or is it a right angle? The angles add to
90.Are the angles supplementary or are they a linear pair? The angles add
to 180.Do you have an angle bisector? The two angles are
congruent.Do you have vertical angles? The two angles are
congruent.
Write the equation and then solve the equation.
1. 2.
Equation: _______________________ Equation: _______________________
x = ______ x = ______
3. 4.
Equation: _______________________ Equation: _______________________
x = ______ x = ______
37
8x (7x + 10)
(6x + 12)
(16x + 4) (18x +
4)
18x(16x + 4)
(7x - 12)
(5x + 18)
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