1. Objectives of the Day Students will be able to
Identify, classify and/or draw: point, line, ray, segment, midpoint, intersection, bisect, plane, space, collinear, coplanar
Define and identify parallel, perpendicular, and skew lines
Apply the terms distance (between two points, two lines, or from a point to a line) and midpoint, bisect and bisector in regard to lines

2. Question of the Day Which statement about this line segment is true?
A  X is the midpoint of
B  X is the midpoint of
C  Y is the midpoint of
D  Y is the midpoint of
Use the figure below to identify the following
A Two coplanar points
B A line segment
C How would you describe LM and JK

3. Foldable Notes
Point – a location in space, no length, width or depth (point B, point C, point X)
Line – series of points that extend in two opposite directions without end.
No endpoints
Collinear Points – on the same line
Ray – part of a line consisting of one endpoint and all the points of the line on one side of the endpoint.
Segment – part of line that is between two points and consists of all the points between them.

4. Foldable Notes
Bisect – when a line, ray, segment or plane crosses a segment at its midpoint
Lines and rays cannot have midpoints – infinitely long, so they cannot be bisected
When a segment is bisected, its halves are congruent (have equal measure)

5. Foldable Notes
Plane – a flat surface, that extends infinitely in all directions
All points, lines, rays, segments are on a plane
Coplanar points – on the same plane
Coplanar lines – on the same plane
Parallel lines
Intersecting lines
Space – the set of all points in three dimensions
Points, lines, rays, planes
Skew Lines – noncoplanar lines that are not parallel and do not intersect.

6. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Point
a location in space, no length, width or depth
point B
point C
point X B C X 6

7. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Line
series of points that extend in two opposite directions without end. L or M N or 7

8. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Ray
part of a line consisting of one endpoint and all the points of the line on one side of the endpoint. F E or D 8

9. Check for Understanding
Identify and label the figures below using proper notation L S 1) 2) M 3) 4) C A H G 9

10. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Segment
part of line that is between two points and consists of all the points between them. J K L 10

11. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Distance
How far apart two points are
measured using a ruler or on a number line
Always a positive number
n inches (etc.)
Or space on a number line P Q 11

12. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Midpoint
A point that divides a segment into two congruent segments. J
pointK K L 12

13. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Bisect
(also called a perpendicular bisector)
when a line, ray, segment or plane crosses a segment at its midpoint
Forms a 90° angle where it intersects J K L 13

14. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Perpendicular Bisector
A line which cuts a segment into two halves at 90° V T U W 14

15. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Plane
a flat surface, that extends infinitely in all directions
- All points, lines, rays, segments are on a plane
- Coplanar points: on the same plane
M and E are coplanar points P F E D M 15

16. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Coplanar Lines
-on the same plane
Two types: parallel and intersecting P B F E A D 16

17. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Parallel Lines
Coplanar lines that never intersect
always the same distance apart
AB║CD or
MB║FD
MA║FC B M D A F C 17

18. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Perpendicular Lines
Coplanar lines that intersect at a 90° angle V T U W 18

19. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Space
- the set of all points in three dimensions
- All points, lines, rays, planes 19

20. Geometry Vocabulary Refresher
KEY TERM
DEFINITION
ILLUSTRATION or EXAMPLE
MATHEMATICAL NOTATION
Skew
-noncoplanar lines that are not parallel and do not intersect. 20

21. Use the figure to name each of the following.
The first letter names the endpoint. HO HO
Name a segment by its endpoints.
, HJ
, and OI
, KI
, OJ
, KI IK
Horizontal line KI has several names.
H, I, J, and K
Name a point with a capital letter.
, and JH
, OK
a. four points
b. four different segments
c. five other names for KI
, KO
, OK
, IO
, and OI
d. five different rays
9-1

22. You are looking directly down into a wooden crate
You are looking directly down into a wooden crate. Name each of the following.
MQ, NR, OS
MP, OP, QT, ST
MN, NO, QR, RS
a. four segments that intersect PT
b. three segments parallel to PT
c. four segments skew to PT

23. Draw two intersecting lines
Draw two intersecting lines. Then draw a segment that is parallel to one of the intersecting lines.
Use the lines on notebook or graph paper.
First draw two lines that intersect.
Then draw a segment that is parallel to one of the lines.

24. PRACTICE Name at least one of each of the terms A E F D B
When you finish, create another figure with points that includes each of the elements above

25. Independent Practice
Name at least one of each of the terms J M K N L