4th grade angles and lines lessons

Grades 3–5 (ages 8–11) · 25 videos · Checked and refreshed daily

Quick answer

In 4th grade (ages 9–10), children draw and name lines, rays and angles, measure angles with a protractor and find lines of symmetry. Start with Math Antics "Angle Basics", then Math with Mr. J lessons and Numberock songs. Play all on repeat, or loop one protractor example.

Play all on repeat

Videos in this playlist

  1. 1Math Antics - Points, Lines, & PlanesMath Antics - Points, Lines, & PlanesmathanticsPlay from here Loop
  2. 2Lines, Line Segments, and Rays | The Difference Between a Line, Line Segment, and RayLines, Line Segments, and Rays | The Difference Between a Line, Line Segment, and RayMath with Mr. JPlay from here Loop
  3. 3How to Name a Line | Geometry | Math with Mr. JHow to Name a Line | Geometry | Math with Mr. JMath with Mr. JPlay from here Loop
  4. 4How to Name a Line Segment | Geometry | Math with Mr. JHow to Name a Line Segment | Geometry | Math with Mr. JMath with Mr. JPlay from here Loop
  5. 5How to Name a Ray | Geometry | Math with Mr. JHow to Name a Ray | Geometry | Math with Mr. JMath with Mr. JPlay from here Loop
  6. 6Parallel, Perpendicular & Intersecting Lines Song | Types of LinesParallel, Perpendicular & Intersecting Lines Song | Types of LinesNumberockPlay from here Loop
  7. 7Math Antics - Angle BasicsMath Antics - Angle BasicsmathanticsPlay from here Loop
  8. 8Intro to Angles Lesson for KidsIntro to Angles Lesson for KidsGenerationGeniusPlay from here Loop
  9. 9Angles for Kids | A fun and engaging intro into the world of angles for kidsAngles for Kids | A fun and engaging intro into the world of angles for kidsLearn BrightPlay from here Loop
  10. 10How to Name an Angle | Math with Mr. JHow to Name an Angle | Math with Mr. JMath with Mr. JPlay from here Loop
  11. 11Angle Properties: Naming Angles with Letters Explained!Angle Properties: Naming Angles with Letters Explained!Mashup MathPlay from here Loop
  12. 12Types of Angles | Obtuse, Acute, Right, & Straight AnglesTypes of Angles | Obtuse, Acute, Right, & Straight AnglesMath with Mr. JPlay from here Loop
  13. 13Types of Angles (Acute, Obtuse, Right, Straight, Reflex) | Math with Mr. JTypes of Angles (Acute, Obtuse, Right, Straight, Reflex) | Math with Mr. JMath with Mr. JPlay from here Loop
  14. 14Math Antics - Angles & DegreesMath Antics - Angles & DegreesmathanticsPlay from here Loop
  15. 15HOW TO USE A PROTRACTOR TO MEASURE ANGLES!HOW TO USE A PROTRACTOR TO MEASURE ANGLES!Mashup MathPlay from here Loop
  16. 16What are Adjacent Angles? | Math with Mr. JWhat are Adjacent Angles? | Math with Mr. JMath with Mr. JPlay from here Loop
  17. 17Classifying Triangles By Their Angles | Math with Mr. JClassifying Triangles By Their Angles | Math with Mr. JMath with Mr. JPlay from here Loop
  18. 18Symmetry - Math AnticsSymmetry - Math AnticsmathanticsPlay from here Loop
  19. 19Intro to Symmetry (Part 1) | What is Symmetry? | Lines of SymmetryIntro to Symmetry (Part 1) | What is Symmetry? | Lines of SymmetryMath with Mr. JPlay from here Loop
  20. 20Intro to Symmetry (Part 2) | What is Symmetry? | Lines of SymmetryIntro to Symmetry (Part 2) | What is Symmetry? | Lines of SymmetryMath with Mr. JPlay from here Loop
  21. 21Lines of Symmetry Math Lesson for KidsLines of Symmetry Math Lesson for KidsGenerationGeniusPlay from here Loop
  22. 22Angles Song | Acute, Obtuse, & Right Angles | 3rd & 4th GradeAngles Song | Acute, Obtuse, & Right Angles | 3rd & 4th GradeNumberockPlay from here Loop
  23. 23Angles Song II | How to Measure Angles With A Protractor | Featuring EarlAngles Song II | How to Measure Angles With A Protractor | Featuring EarlNumberockPlay from here Loop
  24. 24Symmetry Song for Kids | A Day at Symmetry Land | Lines of SymmetrySymmetry Song for Kids | A Day at Symmetry Land | Lines of SymmetryNumberockPlay from here Loop
  25. 25Geometry: Lines & Angles Songs For Kids | 3rd Grade - 5th GradeGeometry: Lines & Angles Songs For Kids | 3rd Grade - 5th GradeNumberockPlay from here Loop

What does this 4th grade geometry unit cover?

It introduces points, lines, line segments and rays, parallel and perpendicular lines, acute, right and obtuse angles, measuring angles in degrees with a protractor, adjacent angles and lines of symmetry. By the end a child should measure a 65° angle and draw a line of symmetry.

How does RepeatWatch help with angles?

Loop the protractor part from A to B while your child measures along with it. Slow to 0.75× to see where the protractor lines up, save the lines, angles and symmetry sections on keys 1–9, and use Repeat one on an angles song.

Frequently asked questions

What grade learns to use a protractor?

In the US, measuring and drawing angles with a protractor is usually taught in 4th grade (ages 9–10), together with lines, rays and symmetry. Grade levels vary by country and school, so start where your child is.

What is the difference between a line, a ray and a segment?

A line goes on forever in both directions, a ray starts at one point and goes on forever in one direction, and a segment has two endpoints. The Math with Mr. J lessons show how to name each one.