1. Points, Lines, and Planes
7-1
Points, Lines, and Planes
Course 1
Warm Up
Problem of the Day
Lesson Presentation

2. Points, Lines, and Planes
Course 1
7-1
Points, Lines, and Planes
Warm Up
What geometry term might you associate with each object?
1. a string on a guitar
2. a window
3. the tip of a pencil
4. a sheet of paper
line segment
plane or rectangle
point
plane or rectangle

3. Points, Lines, and Planes
Course 1
7-1
Points, Lines, and Planes
Problem of the Day
Draw a clock face that includes the numerals 1–12. Draw two lines that do not intersect and that separate the clock face into three parts so that the sums of the numbers on each part are the same.

4. Points, Lines, and Planes
Course 1
7-1
Points, Lines, and Planes
Learn to describe figures by using the terms of geometry.

5. Insert Lesson Title Here
Course 1
7-1
Points, Lines, and Planes
Insert Lesson Title Here
Vocabulary
point
line
plane
line segment
ray

6. Points, Lines, and Planes
Course 1
7-1
Points, Lines, and Planes
The building blocks of geometry are points, lines, and planes.
A point is an exact location. P point P, P
A point is named by a capital letter.
A line is a straight path that line AB, AB, extends without end in A B line BA, BA opposite directions.
A line is named by two points on the line.
A plane is a flat surface that plane LMN, extends without end in all plane MLN, directions plane NLM
A plane is named by three points on the plane that are not on the same line. M N L

7. Additional Example 1A &1B: Identifying Points, Lines, and Planes
Course 1
7-1
Points, Lines, and Planes
Additional Example 1A &1B: Identifying Points, Lines, and Planes
Use the diagram to name each geometric figure.
A. three points
M, N, and P Q N P R M
Five points are labeled: points M, N, P, Q, and R.
B. two lines
PR and NR
You can also write RP and RN.

8. Additional Example 1C & 1D: Identifying Points, Lines, and Planes
Course 1
7-1
Points, Lines, and Planes
Additional Example 1C & 1D: Identifying Points, Lines, and Planes
Use the diagram to name each geometric figure.
C. a point shared by two lines
point R
Point R is a point on PR and NR. Q N P R M
D. a plane
plane QRM
Use any three points in the plane that are not on the same line Write the three points in any order.

9. Use the diagram to name each geometric figure.
Course 1
7-1
Points, Lines, and Planes
Try This: Example 1A &1B
Use the diagram to name each geometric figure.
A. three points
S, T, and U
Five points are labeled: points S, T, U, V, and W. V S U W T
B. two lines
UW and SW
You can also write WU and WS.

10. Use the diagram to name each geometric figure.
Course 1
7-1
Points, Lines, and Planes
Try This: Example 1C & 1D
Use the diagram to name each geometric figure.
C. a point shared by two lines
point W
Point W is a point on WS and WU. V S U W T
D. a plane
plane VUT
Use any three points in the plane that are not on the same line Write the three points in any order.

11. Points, Lines, and Planes
Course 1
7-1
Points, Lines, and Planes
A line segment is a line segment XY, XY, made of two endpoints Y line segment YX, YX and all the points between X the endpoints.
A line segment is named by its endpoints.
A ray has one endpoint ray JK, JK From the endpoint, the ray J K extends without end in one direction only.
A ray is named by its endpoint first followed by another point on the ray.

12. Additional Example 2A & 2B: Identifying Line Segments and Rays
Course 1
7-1
Points, Lines, and Planes
Additional Example 2A & 2B: Identifying Line Segments and Rays
Use the diagram to give a possible name to each figure.
A. three different line segments C A B
AB, BC, and AC
You can also write BA, CB, and CA.
B. three ways to name the line
AB, BC, and AC
You can also write BA, CB, and CA.

13. Additional Example 2C & 2D: Identifying Line Segments and Rays
Course 1
7-1
Points, Lines, and Planes
Additional Example 2C & 2D: Identifying Line Segments and Rays
Use the diagram to give a possible name to each figure.
C. six different rays C A B
AB, AC, BC, CB,
CA, and BA
D. another name for ray AB AC
A is still the endpoint C is another point on the ray.

14. Points, Lines, and Planes
Course 1
7-1
Points, Lines, and Planes
Try This: Example 2A & 2B
Use the diagram to give a possible name to each figure.
A. three different line segments F D E
DE, EF, and DF
You can also write ED, FE, and FD.
B. three ways to name the line
DE, EF, and DF
You can also write ED, FE, and FD.

15. Points, Lines, and Planes
Course 1
7-1
Points, Lines, and Planes
Try This: Example 2C & 2D
Use the diagram to give a possible name to each figure.
C. six different rays F D E
DE, EF, DF, FE,
FD, and ED
D. another name for ray DE DF
D is still the endpoint F is another point on the ray.

16. Points, Lines, and Planes Insert Lesson Title Here
Course 1
7-1
Points, Lines, and Planes
Insert Lesson Title Here
Lesson Quiz
Use the diagram to name each geometric figure.
1. three points
2. two lines
3. a point shared by a line and a ray
4. a plane
Possible answer: A, B, C
Possible answer: AD, CE
Possible answer: F
Possible answer: plane AEC