C H A PTE R 12 Angles - Mrs. Blumer's 5th grade

? 2009 Marshall Cavendish International (Singapore) Private Limited. Copying is permitted; see page ii.

C

Name:

Date:

R

HAPTE

12 Angles

Lesson 12.1 Angles on a Line

Find the unknown marked angles. The diagrams are not drawn to scale.

1. AC is a line. Find the measure of DBE.

D

E

78? 47?

A

B

C

2. PR is a line. Find the measure of PQT.

T

S

37?

P

Q

R

Extra Practice 5B 75

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Date:

3. CE is a line. Find the measure of FDG.

G

H

F

29?

37?

58?

C

D

E

4. SU is a line. The measure of y is twice as big as the measure of x and the measure of z is half the measure of a right angle. Find the measure of y.

y

x

z

S

T

U

? 2009 Marshall Cavendish International (Singapore) Private Limited. Copying is permitted; see page ii.

76 Chapter 12 Lesson 12.1

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Lesson 12.2 Angles at a Point

Find the unknown marked angles. The diagrams are not drawn to scale. 1. Find the measure of a.

96?

a

128?

? 2009 Marshall Cavendish International (Singapore) Private Limited. Copying is permitted; see page ii.

2. Find the measure of b.

49? b

Extra Practice 5B 77

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Date:

3. AB and CD meet at O. Find the measure of c.

A C

126? O 42? cE

D

B

4. AB is a line. The measure of e is 2 times the measure of d. Find the measures of d and e.

A D

56? 118?

e d C

B

? 2009 Marshall Cavendish International (Singapore) Private Limited. Copying is permitted; see page ii.

78 Chapter 12 Lesson 12.2

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Lesson 12.3 Vertical Angles

Find the unknown marked angles. The diagrams are not drawn to scale. 1. AB, CD, and EF meet at G. Find the measure of DGE.

C

55? G A

E

F 28?

B

D

? 2009 Marshall Cavendish International (Singapore) Private Limited. Copying is permitted; see page ii.

2. AB, CD, EF, and GH meet at O. Find the measure of EOH.

C

E

45? O

H 32?

A

B

68?

G F

D

Extra Practice 5B 79

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