OBJECTIVE: To
define, illustrate, and
identify some of the
basic terms in
Geometry.
Term Idea
POINT
Picture
Singular
location
B
LINE
A
~
Flat, 2
PLANE Dimensions
Term
Definition
COLLINEAR
(adj.) To lie
on the same
line together.
Example
Term
B
A
Term
(adj.) To lie in
the same
plane together
E
C
c
D
Example
“A, B, C, and D
are coplanar.
They all lie in
plane c A ”
Term
Definition
“ A , C and D
are noncollinear.
They do not all
lie on line ~ ”
Example
E
A
c
B
C
D
(adj.) To not
B
A
not all
lie on the
same line
D
Definition
COPLANAR
D
~
A
~
Example
C
NONCOLLINEAR (adj.) To
C
HJJG
HJJG
AB or BA
line k
e
e
Definition
“A , B and C
are collinear.
They all lie
on line ~ ”
B
A
A
Straight, 1
Straight
Dimension
Symbol
NONCOPLANAR all lie in the
same plane
together
“A B D & E are
“A,B,D,&
noncoplanar.
They all do not
all lie in
plane c A ”
1
Term
Definition
Example
E
B
A
c
Two lines intersect in a
point
________.
C
D
To have
one or
more
common
points
INTERSECT
HJJG
“ EB intersects
plane c at point
B. (B is their
intersection.)”
Two planes intersect in a
line
________.
c
Give
another
name for
HJG
J
d
P
f
M
N
L
Give
another
name for
HJJG
J
P
f
L
N
K
H
P
f
M
Name 3
collinear
points:
J
KN .
K
H
JL .
K
H
L
M
N
2
Name 3
noncollinear
points:
J
K
H
P
f
P
N
Name the
intersection
of:
J
HJJG
f and JN
K
H
M
L
Name the
intersection
of:
J
L
K
P
f
M
L
Name 5
noncoplanar
points:
H
N
P
N
J
K
H
M
L
Name 4
noncoplanar
points:
J
f
P
f
N
f
K
H
M
L
Name 4
coplanar
points:
J
M
N
P
f
L
HJG
f and JL
K
H
M
N
3
Name the
intersection
of:
J
P
f
M
Term
Idea
Picture Symbol
J
Have
equal
lengths
K
P
6"
Q
R
QR ≅ TS
QT ≅ RS
T
A
Task
J
JK
6"
or KJ
K
JK = 6
or
KJ = 6
Formula
JK ≅ PO
6"
O
EXAMPLES:
Symbol
A
positive
real
number
N
L
Picture
Part of a
line, has 2
endpoints
HJJG
HJJG
HL and KN
K
H
Term Idea
S
C
B
FINDING
DISTANCE
(lengths)
on a
NUMBER
LINE
2. If AB=8 then
4
4 and CB=_____
AC=_____
.
3
11
19
A
B
C
D
CD = _____
BC = _____
AC = _____
AB = _____
AD = _____
Subtract
coordinates
(HigherLower)
EXAMPLES: AC=12.5, CB=7.2
12.5
1. If AC=8 then
16 .
8
CB=_____
CB
and AB
AB=_____
Example
-13
7.2
C
A
B
Find AB.
12.5 + 7.2 = 19.7
4