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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. , , ,

Name______________________________________________________________________ Date__________________ Hour_____________

3.2 Notes – Angle Measure

Geometry G

In geometry, angles are measured in units called ____________________.

The symbol is _______.

There are 4 different types of angles:

|Name of angle |Definition |Example |

| | | |

| | | |

|ACUTE | | |

| | | |

| | | |

| | | |

|OBTUSE | | |

| | | |

| | | |

| | | |

|RIGHT | | |

| | | |

| | | |

| | | |

|STRAIGHT | | |

| | | |

Example 1:

Use a protractor to measure [pic]. What kind of angle is it?

Example 2:

Find the measure of each angle and classify it.

a) [pic] b) [pic] c) [pic] d) [pic]

I

V

L

E D S

Example 3:

Use a protractor to draw an angle having each measurement. Then classify each angle.

a) [pic] b) [pic]

Example 4:

The measure of [pic]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?

1. _______________________________________________________________________________

2. _______________________________________________________________________________

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.

Draw each angle using a Protractor.

7. [pic] 8. [pic]

9. [pic] 10. [pic]

11. [pic] 12. [pic]

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(

Name_____________________________________________________ Date________________ Hour_______

3.3 Notes – The Angle Addition Postulate

Geometry G

Suppose m(KNL = 110( and m(LNM = 25(. What would you do to find the m(KNM?

Suppose m(MNK = 155( and m(LNM is 30(. What would you do to find the m(LNK?

Angle Addition Postulate

For any (ABC, if D is in the interior of (ABC, then m(ABD + m(DBC = m(ABC.

Draw a diagram below to show this.

Vocabulary

A _______ that divides an angle into ____________ angles of equal ________________

is called the ___________________________________.

Geometry G Name________________________

Worksheet 3.3

SHOW ALL YOUR WORK!!

1. Find m(1 if m(CUB = 78. 2. Find m(2 if m(WHI = 160.

3. m(SOX = 160

m(1 = x + 14

m(2 = 3x – 10

Find m(2

4. m(BEA = 71. Find m(REA.

5. m(WOV = 12x. Find m(LOV.

6. m(FIE = 3x, m(RIE = 42(, m(FIR = 5x

Find m(FIR.

7. m(HAK = 4x – 2, m(KAW = 2x – 5,

and m(HAW = 77.

Find m(HAK and m(KAW.

8. US bisects (BUL, m(BUS = 2x + 10,

and m(SUL = 3x – 18.

Find m(BUL.

9. m(TRI = 3x – 5, m(IRB = x + 27,

and m(TRB = 86.

Does RI bisect (TRB?

10. Find the measure of each angle.

a. m(NEO = _______ b. m(DES = _______

c. m(DEO = _______ d. m(SEO = _______

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 _________________ ________________.

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.

Find the measure of each angle in the diagram.

[pic]DAB is a right angle

[pic]ADE is a right angle

[pic]1 = 53(

m[pic]1 = m[pic]12

[pic]3 = 55(

[pic]5 = 88(

m[pic]4 = m[pic]9

[pic]ABE = 100(

[pic]DEB = 80(

Geometry G Name_________________________

Worksheet 3.5

Supplementary and Complementary Angles

Find the measures of angles 1 through 22. Mark them in your diagram.

23) Find m(DBC.

24) Find m(DBC.

25) (1 and (2 are complementary. m(1 = 2x + 7 and m(2 = 4x – 19. Find the measure of each angle.

26) (3 and (4 are supplementary. m(3 = 5x + 22 and m(4 = 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

Name_________________________________________ Date________ Hour____

3.6 – Vertical Angles

Geometry G

Vertical Angles:

THEOREM:

Examples:

1) Find x, y, and z

x

51( Y

z

2) Given: m(4 = (2x + 5)(

m(5 = (x +30)(

Find: m(6

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

4) Find x and y if (CBD is congruent to (FDG.

5) Find each of the following:

a) x

b) m(LAT

c) m(TAO

d) m(PAO

Vocabulary Words:

Complementary Angles Supplementary Angles Right Angles Angle Bisector Linear Pair Vertical Angles

Adjacent Angles.

ST bisects [pic]

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? ___________________________________

In the figure, GA and GD, and GB and GE are opposite rays.

10] Which angle forms a linear pair with [pic]? ________

11] Do [pic] and [pic] form a linear pair? ________

12] Name two angles that are adjacent to [pic]. ________ ________

13] Name two angles that form a linear pair with [pic]. ________ ________

14] Name three angles adjacent to [pic]. ________ ________ ________

15] Do [pic] and [pic] form a linear pair? ________

16] Name the vertical angle to[pic]. _______________

17] Name another pair of vertical angles. ____________ and _______________

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( |

| | | |

| | | |

| | | |

| | | |

| | | |

| | | |

| | | |

| | | |

| | | |

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 = ______

5. 6.

Equation: _______________________ Equation: _______________________

x = ______ x = ______

7. 8.

Equation: _______________________ Equation: _______________________

x = ______ x = ______

[pic] [pic]

3.7 – Perpendicularity Name____________________________

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 [pic]

What conclusions would I be able to make if given the following: [pic]

1)

2)

Example 1: True or False?

1. (PRN is acute.

2. (4[pic](8

3. m(5 + m(6 = 90

4. [pic]

5. (7 is obtuse

Example 2:

Find x.

Example 3:

Find m(DBC.

Geometry G Name____________________________

Section 2.5. Worksheet 3

Warm – Up:

1. 2.

[pic] ST bisects [pic], [pic]

[pic][pic]

3. 4.

[pic] [pic] & BD bisects [pic]

[pic] [pic] [pic]

5.

AB [pic] CD [pic]

CE bisects [pic]

[pic]

[pic]

6.

[pic]

[pic]

BC bisects [pic] [pic]

7.

[pic]

[pic]

8.

BD bisects [pic] and [pic]

[pic]

[pic]

9. [pic]

[pic] [pic]

[pic]

[pic]

[pic]

[pic]

10. AB [pic] CD [pic]

HE bisects [pic]

[pic] [pic]

[pic]

[pic]

[pic]

[pic]

[pic]

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 = ______

[pic] [pic]

Geometry G Name____________________________

Section 2.5. Worksheet 6

5. 6.

Equation: _______________________ Equation: _______________________

x = ______ x = ______

[pic] [pic]

Note: Picture is not drawn to scale.

7. BD bisects [pic] 8.

Equation: _______________________ Equation: _______________________

x = ______ x = ______

[pic] [pic]

9.

Equation: _______________________

x = ________ [pic]

[pic] [pic]

10. 11.

Equation:_________________________ Equation:_________________________

x = ________ x = ________

[pic] [pic]

[pic] [pic]

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 = ______

[pic] [pic]

-----------------------

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(16x + 4)(

18x(

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(7x - 12)(

8x(

(7x + 10)(

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(16x + 4)(

(6x + 12)(

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D

G

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