1. GEOMETRY

2. Point– A location in a plane or in space.

3. 2. LINE– A set of points that moves continuously
in opposite directions.
A straight path of points.
. A
Symbol AB .B

4. . A . B 3. Line Segment– a part of a line having two endpoints. Symbol

5. 4. Ray– A part of a line that has one
endpoint and extends endlessly in
one direction.
. A
Symbol AB
. B

6. 5. Endpoint– a point at the end of a
segment or a ray.

7. 6. Plane– a flat surface extending endlessly in all directions..B

8. 7. Congruent—Same size, same shape.B A C D F
Symbol
ABC =
DEF

9. 8. Vertex– A point where two or more sides of a geometric figure meet.

10. 9. Vertical– lines moving in an up and down position.
Symbol
AB is a vertical line.
. B

11. 10. Horizontal– lines moving in a left to right position.
Symbol
AB is a
Horizontal line. A B . .

12. 11. Straight – The shortest distance
between two points. . .

13. 12. Intersecting lines– lines that have exactly one point in common.
. D
Symbol
AB intersects
CD at X.
. A
. X .B
. C

14. Parallel Lines – Lines in the same plane that never intersect.
. A B
. X Y
Symbol
AB XY

15. 16. Perpendicular Lines– two lines
that intersect to form right angles.
Symbol:
. X
.A B
AB XY
. Y