Lines and Angles

Duane Habecker

A series of applets about lines and angles for 10 to 12 year old students.


  • 1. Basic Geometric Objects and definitions
  • 2. Types of angles
  • 3. Animated acute angles
  • 4. Animated view of right angles.
  • 5. Animated view of obtuse angles.
  • 6. Animated view of straight angles.
  • 7. Animated view of reflex angles.
  • 8. Protractor Practice (Not Random)
  • 9. Protractor Practice (Random)
  • 10. Sum of angles in polygons
  • 11. Angles in a 5-pointed star
  • 12. Sum of interior angles in a triangle
  • 13. Sum of the angles in a triangle
  • 14. Missing angle in a triangle
  • 15. Definition of complementary angles
  • 16. Missing complementary angle
  • 17. Supplementary angles
  • 18. Missing supplementary angle
  • 19. Vertical angles
  • 20. Triangle on a line with missing angles
  • 21. Angles on a line
  • 22. Broken Protractor

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Basic Geometric Objects and definitions

This applet is a simple display of some common geometric objects our 10-year olds will be using.
– Duane Habecker

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情報