Name ________________________________________ Date __________________ Class__________________
LESSON
1-1
Practice A
Understanding Points, Lines, and Planes
Use the figure for Exercises 1–3.
HJJG
1. Name two points that determine line AC.
_________________________________________
2. Name a point that is NOT collinear with point A
and point C.
_________________________________________
3. Name the points that determine plane ABC.______________________________________
4. Two points determine one ______________________ .
5. Collinear points lie on the same ________________________.
6. Three noncollinear points determine a ______________________ .
7. Coplanar points lie in the same ________________________.
Use the figure for Exercises 8–10.
8. A line segment is a part of a line and has two endpoints.
Name the endpoints of TU.
_________________________________________________________
JJJG
9. Find the number of endpoints of UV . _________________
JJJG
10. A ray is a part of a line that has one endpoint. Name the endpoint of UV .
_________________________________________________________
11. A constellation is a group of stars that
people use to make a picture. The
seven stars make the Big Dipper.
Draw DE, FE, FG, GH, HI, JG,
and JI, to complete the picture.
12. Points P and Q lie in a plane. Of PQ,
HJJG
JJJG
PQ, or PQ, name the one that has
no endpoints.
_________________________________________
Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor.
1-3
Holt McDougal Geometry
Answers for the chapter Foundations for Geometry
1-1 UNDERSTANDING POINTS, LINES,
Practice C
AND PLANES
1. A plane is named with three noncollinear
points. H, I, and J are collinear.
2. Possible answers: plane HIK; plane HJK;
plane IJK
HJG HJJG HJG HJG HJJG
HJG
3. HI, HJ, IJ, IH, JH, and JI
JJJG
JJJG
4. ST and TS are not the same figure
JJJG
because ST has its endpoint at S and
JJJG
TS has its endpoint at T.
JJJG
JJJG
5. ST and TS are not opposite rays
because they do not have the same
endpoint.
6. a line
7. point, line, plane
8. Through any three noncollinear points
there is exactly one plane containing them.
9. If two planes intersect, then they intersect
in exactly one line.
Practice A
1. point A and point C
2. point B
3. point A, point B, and point C
4. line
5. line
6. plane
7. plane
8. point T and point U
9. one
10. point U
11.
HJJG
12. PQ
Practice B
1. Possible answers: plane BCD; plane BED
2. BD, BC, BE,or CE
HJJG HJJG HJJG
3. Possible answers: EC; BC; BE
4. Points B, C, and E
10.
5. Possible answers: points B, C, and D or
point B, E, and D
Reteach
1. •W
6. point B
JJJG
JJJG
7. BC and BE
2.
3.
8. points X, Y, and Z
HJJG
5. line CD or CD
9. point Z
HJJG
HJJG
10. XZ and YZ
HJJJG
11. XY
4.
JJJG
6. ray ST or ST
7. plane LMN; plane Q
8. segment WX; WX
9. Possible answers: A, P, and B; C, P, and
D; J, D, and K
12.
13.
10. Sample answer: A, P, and D
14.
11. Sample answer: C, P, B, and D
12. Sample answer: J, D, P, and B
HJJG
HJJG
13. AB and JK
14. point D
Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor.
A1
Holt McDougal Geometry