2. VOCABULARY
UNDEFINED TERMS (Intuitive ideas – not “defined” in space – cannot take definite measurements)
Point
Line
Plane

3. VOCABULARY
UNDEFINED TERMS (Intuitive ideas – not “defined” in space – cannot take definite measurements)
Point
Takes up no space
Represented by a dot
Indicates a location
Named with a capital letter
All geometric figures are made of points
Line
Represents all points that extend in two opposite directions
Takes up no space
Named by two points on the line, with an arrow drawn above extending in both directions, OR a lower case letter
Plane
Extends in all directions – no edges, though we draw it and label it as a “shape”
Has no thickness
Named by a single upper case letter, or by a series of upper case letters

4. VOCABULARY (cont.)
(The following terms are NOT “undefined” – but may use undefined terms in their definitions)
Space
Collinear Points
Noncollinear Points
Coplanar Points
Noncoplanar Points
Intersection

5. VOCABULARY (cont.)
(The following terms are NOT “undefined” – but may use undefined terms in their definitions)
Space
Set of all points
Collinear Points
Points all on one line
Noncollinear Points
Coplanar Points
Points all on one plane
Noncoplanar Points
Intersection
Where two geometric figures (lines, planes, or shapes) meet or cut through one another.

7. m p K m and p intersect at K m and p intersect on K
K is the intersection of m and p.

8. z and y are in M
M contains z and y
B intersects M at Y
Y is the intersection of M and b

9. N
M and N intersect in 𝑋𝑌
𝑋𝑌 is the intersection of M and N
𝑋𝑌 is in M and N
M and N contain 𝑋𝑌 X M Y

10. s P is in R false Line s is in P true 𝐴𝐵 contains G 𝑓𝑎𝑙𝑠𝑒
R contains 𝐴𝐵
D is on s
D and G are in P
P contains C
false
true
𝑓𝑎𝑙𝑠𝑒 s

11. HOMEWORK: Page 7-9: 1-10 all, 12,15,18,20,21,24,27(why or why not), 30, 36, and “Challenge.”