1-2
Points, Lines, and Planes
PART 1
Vocabulary
Review
Draw a line from each net in Column A to the three-dimensional figure it
represents in Column B.
Column A
Column B
1.
2.
Vocabulary Builder
conjecture (noun, verb) kun JEK chur
Main Idea: A conjecture is a guess or a prediction.
Definition: A conjecture is a conclusion reached by using inductive reasoning.
Use Your Vocabulary
Write noun or verb to identify how the word conjecture is used in each sentence.
4. You make a conjecture that your volleyball team will win.
5. Assuming that your sister ate the last cookie is a conjecture.
6. You conjecture that your town will build a swimming pool.
Chapter 1
10
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3.
Key Concept Undefined and Defined Terms
Write the correct word from the list on the right. Use each word only once.
Undefined or Defined Term
Diagram
Name
A
A
7.
line
opposite rays
plane
point
B
8.
A
A
9.
B
C
P
B
A
11.
AB
B
A
12.
segment
P
A
10.
ray
AB
C
AB
B
CA, CB
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Column A
z
B
Draw a line from each item in Column A to its description in Column B.
Column B
A
C
13. plane HGE
intersection of AB and line z
14. BF
plane AEH
15. plane DAE
line through points F and E
16. line y
intersection of planes ABF and CGF
17. point A
plane containing points E, F, and G
D
F
G
x
E
y
H
Points that lie on the same line are collinear points. Points and lines that lie in the same
plane are coplanar. All the points of a line are coplanar.
Problem 1 Naming Points, Lines and Planes
* )
Got It? What are two other ways to name RS ?
T
Underline the correct word or letter to complete
each sentence.
R Q
* )
18. RS is a line / segment .
P
* )
19. The lowercase letter that represents RS is ℓ / m .
11
V
N
S m
Lesson 1-2, Part 1
* )
20. Circle the points that are on RS .
N
P
Q
* )
21. Cross out the lines that do NOT name RS .
* )
* )
* )
* )
NQ
NT
PV
R
S
* )
QR
QS
T
* )
* )
RQ
SQ
V
* )
SR
Naming Segments and Rays
Problem 2
)
)
Got It? Reasoning EF and FE form a line. Are they opposite rays? Explain.
For Exercises 22–26, use the line below.
)
)
22. Draw and label points E and F. Then draw EF in one color and FE in another color.
)
)
)
)
23. Do EF and FE share an endpoint?
Yes / No
24. Do EF and FE form a line?
Yes / No
25. Are EF and FE opposite rays?
Yes / No
)
)
26. Explain your answer to Exercise 25.
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Lesson Check • Do you UNDERSTAND?
)
)
Are AB and BA the same ray? Explain.
Underline the correct symbol to complete each sentence.
)
)
27. The endpoint of AB is A / B .
28. The endpoint of BA is A / B .
)
)
29. Use the line. Draw and label points A and B. Then draw AB and BA .
)
)
30. Are AB and BA the same ray? Explain.
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Chapter 1
12
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