Lines and Angles

Topic outline

• 

  Lines and Angles
• 

  Geometric Objects

  • Definitions Page
• 

  Types of Angles

  • Definitions and Examples Page
• 

  Using a Protractor

  • Practice Page
• 

  Angles in Polygons

  • Investigate Page
• 

  Angles in a Star

  • Investigate Page
• 

  Sum of the Angles in a Triangle

  • Investigate Page
  • Why is the Sum Always 180º? Page
  • Why is the Sum Always 180º? A Different Look Page
  • Find the Missing Angle Page
• 

  Complementary Angles

  • Definition and Examples Page
  • Practice - Find the Missing Angle Page
• 

  Supplementary Angles

  • Definition and Examples Page
  • Practice - Find the Missing Angle Page
• 

  Vertical Angles

  • Definition and Examples Page
• 

  Practice

  • Find the Missing Angles with a Triangle on a Line Page
  • Find the Missing Angle on a Line Page