Transcript Slide 1
8-1 Building Blocks of Geometry
Learn to describe figures by using the
terms of geometry.
8-1 Building Blocks of Geometry
Vocabulary
point
line
plane
line segment
ray
8-1 Building Blocks of Geometry
The building blocks of geometry are points, lines, and planes.
8-1 Building Blocks of Geometry
Additional Example 1: Identifying Points,
Lines, and Planes
Use the diagram to name the geometric figure.
A. three points
M, N, and P
Five points are
labeled: points M, N,
P, Q, and R.
B. two lines
PR and NR
You can also write RP and RN.
8-1 Building Blocks of Geometry
Additional Example 1: Identifying Points,
Lines, and Planes
Use the diagram to name the geometric figure.
C. a point shared by two lines
point R
Point R is a point on
PR and NR.
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.
8-1 Building Blocks of Geometry
Check It Out: Example 1
Use the diagram to name the geometric figure.
A. three points
S, T, and U
Five points are
labeled: points S, T,
U, V, and W.
U
V
B. two lines
UW and SW
You can also write WU and WS.
W
T
S
8-1 Building Blocks of Geometry
Check It Out: Example 1
Use the diagram to name the geometric figure.
C. a point shared by two lines
point W
Point W is a point on
WS and WU.
U
V
W
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.
T
S
8-1 Building Blocks of Geometry
8-1 Building Blocks of Geometry
Additional Example 2: Identifying Line
Segments and Rays
Use the diagram to give a possible name to the
figure.
A. three different
line segments
AB, BC, and AC
You can also write BA,
CB, and CA.
A
B
B. three ways to name the line
AB, BC, and AC
You can also write BA, CB, and CA.
C
8-1 Building Blocks of Geometry
Additional Example 2: Identifying Line
Segments and Rays
Use the diagram to give a possible name to the
figure.
C. six rays
AB, AC, BC, CB,
A
CA, and BA
D. another name for ray AB
AC
A is still the endpoint.
C is another point on the ray.
B
C
8-1 Building Blocks of Geometry
Check It Out: Example 2
Use the diagram to give a possible name to the
figure.
A. three different
line segments
DE, EF, and DF
You can also write ED,
FE, and FD.
D
B. three ways to name the line
DE, EF, and DF
You can also write ED, FE, and FD.
E
F
8-1 Building Blocks of Geometry
Check It Out: Example 2
Use the diagram to give a possible name to the
figure.
C. six rays
DE, EF, DF, FE,
D
FD, and ED
D. another name for ray DE
DF
D is still the endpoint.
F is another point on the ray.
E
F
8-1 Building Blocks of Geometry
Lesson Quiz
Use the diagram to name each geometric
figure.
1. three points Possible answer: A,
B, C
2. two lines
Possible answer: AD, CE
3. a point shared by a line and
Possible answer: F
a ray
4. a plane
Possible answer: plane AEC