1. Crossword Objective Terms/Dictionary Conga Line

2. Window Pane
TERM
Picture Like
Definition
Useful example

3. Undefined Terms Points, Lines, & Planes
The principal concepts foundations of any Euclidean geometry.
Points, Lines, & Planes

4. Postulates
The underlying assumptions in a geometric system. Do not require a proof and presumed to be true.

5. Theorems
Are statements that require a proof to be true.

6. Point
a location in space represented by a dot
Point A A
Point Y Y

7. Line
A series of points that are extended infinitely in opposite directions
AB or BA
line m A B m

8. Line Segment
A part of a line with two points, called endpoints, and all points between them
PQ or QP P Q

9. Ray
Part of a line consisting of one endpoint and all the points of the line on one side of the endpoint TV T V

10. Plane A flat surface extending infinitely in all directions.
***Any 3 non-collinear pts. always form a plane X B A C
Plane X
Plane ABC

11. Collinear points
Points that lie on the same line T V U W

12. Non-collinear points
Three or more points that do not lie on the same line T V U W

13. Coplanar
Points that lie in the same plane; lines that lie in the same plane X B A C

14. Non-coplanar
Four or more points that do not lie in the same plane; lines that do not lie in the same plane

15. Opposite rays
Two rays with a common endpoint which form a line

16. Intersecting lines
Lines that meet at a single point

17. Parallel Lines
Coplanar lines that do not intersect
MN // OP

18. Perpendicular Lines
Lines that meet to form 90° angles
SQ ┴ PR

19. Skew Lines
Non-coplanar lines that do not intersect
AB is skew to EF

20. Congruent
Objects of the same shape and size

21. Congruent segments
Segments of the same length
EF HG

22. Midpoint A point that divides a segments into two congruent segments
PM MQ, M is the midpoint

23. Segment Bisector
Segment, line, or ray that passes though the midpoint of a segment

24. Angle
Formed by two rays with common endpoint
<ABC or <B