Points, Lines & Angles Study Guide
4th Grade
What are these things?!?!
Term / Definition1. What is a point?
2. What is a line?
3. What is a line segment?
4. What is a ray?
5. What is an angle?
6. What is a vertex? / 1. A point is an exact location in space. It has no length or width
2. A line is a straight path that is endless in both directions. It is a collection of points. It has no endpoints.
3. A line segment is part of a line. It has two end points and includes all the points in between those end points.
4. A ray is a part of a line. It has one end point and continues on forever in one direction.
5. An angle is two rays that share the same endpoint.
6. The point where two rays come together in an angle is the vertex.
How do we name them?
Term / Picture / Name7. How do you name a point? / Named: Point P / 7. When writing it you must write out the word “point”.
Always has to be a CAPITAL letter!
8. How do you name a line? /
Named: / 8. Name by the points closest to the arrows or by a single lowercase letter. The order does not matter.
9. How do you name a line segment? /
Named: / 9. Name by the two endpoints. The order does not matter.
10. How do you name a ray? /
Named: / 10. Name by the endpoint followed by the point closest to the arrow The order DOES matter!
11. How do you name an angle? /
Named: / 11. To name, use three letters in this order: a point on one ray, the vertex, and a point on the other ray.
OR you can name it by the vertex point. OR you can name it by the number written inside the vertex.
Other Lingo:
Term / Definition12. What are parallel lines?
13. What are intersecting lines?
14. What are perpendicular lines? / 12. Parallel lines are lines that never intersect. They are the same distance apart…forever!
13. Intersecting lines are lines that cross and have one point in common.
14. Perpendicular lines are intersecting lines that form RIGHT angles where they cross.
Sample questions:
Picture / Question to go with the picture / Answer/ 15. Name the angle with the heart in it.
16. Name the angle with the smiley face in it.
17. Name the angle with the moon in it. / 15.
16.
17.
/ 18. Where do LM and JK intersect?
19. Which lines are parallel?
20. Which lines are perpendicular? / 18.
19.
20.
/ 21. Where do QW and MO intersect?
22. Which lines are parallel?
23. Which lines are perpendicular? / 21.
22.
23.
REMEMBER: Using Colored Pencils to highlight the specific
lines on your test could help you A LOT!!!