1. 5th Grade Geometry Lines & Angles
Lauri Hagie
IDT 503
Final Project

2. Lines Lines have arrows on each end.
Lines do not end; they go on and on forever in both directions.

3. Line Segments Line segments may also be called segments.
Line segments are part of a line.
Line segments do not have arrows.

4. Rays Rays begin with a point at one end.
Rays go on and on forever in only one direction.
Rays have an arrow on one end.

5. Horizontal Lines, segments, and rays may be drawn horizontally.
Horizontal means level with the horizon.
The horizon is the line in the distance where the land and the sky meet.
Horizontal Line
Horizontal Segment
Horizontal Rays

6. Vertical Lines, segments, and rays may be drawn vertically.
Vertical Segment
Lines, segments, and rays may be drawn vertically.
Vertical means straight up and down.
Vertical Rays

7. Oblique Lines, segments, and rays may be oblique.
Oblique Segment
Lines, segments, and rays may be oblique.
Oblique means slanted.
Oblique Rays

8. Parallel Lines, segments, and rays may be parallel.
Parallel, Oblique Lines
Lines, segments, and rays may be parallel.
Parallel lines go in the same direction and will never cross over each other.
Parallel lines can be horizontal, vertical or oblique.
Parallel, Horizontal Segments
Parallel, Vertical Rays

9. Intersecting Lines, segments, and rays may cross over each other.
We call this intersecting.
Intersecting Segments
Intersecting Rays

10. Perpendicular Lines, segments, and rays may be perpendicular.
When lines intersect and form square corners, we call them perpendicular.
Perpendicular Segments
Perpendicular Rays

11. Angles Angles form when lines, segments, or rays intersect.
There are 3 types of angles:
Acute
Right
Obtuse

12. Right Angles
Right angles are 90
They form square corners.

13. Acute Angles
Acute angles are less than 90
“A cute” little angle.

14. Obtuse Angles
Obtuse angles are greater than 90

15. Quiz Time!
Name this figure:
Line Segment Ray

16. Correct!
Way to go,
You are right!

17. Your answer was not correct. Try again.
Sorry…
Your answer was not correct. Try again.

18. Quiz Time!
Name this figure:
Horizontal Vertical Oblique

19. Correct!
Way to go,
You are right!

20. Your answer was not correct. Try again.
Sorry…
Your answer was not correct. Try again.

21. Quiz Time!
Name this figure:
Parallel Perpendicular

22. Correct!
Way to go,
You are right!

23. Your answer was not correct. Try again.
Sorry…
Your answer was not correct. Try again.

24. Quiz Time!
Name this figure:
Acute Right Obtuse

25. Correct!
Way to go,
You are right!

26. Your answer was not correct. Try again.
Sorry…
Your answer was not correct. Try again.

27. You are now a 5th grade expert in geometry!
The End
You are now a 5th grade expert in geometry!
Hake, S., & Saxon, J. (2001) Math 65: an incremental development, 2nd edition. Norman, OK: Saxon Publishers, Inc.