Triangle Angle Sum
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Triangles: Angle Sum Theorem

  
 

Discover that the angles in a triangle always sum to 180°. Prove the Triangle Sum Theorem visually and algebraically. Use the Triangle Sum Theorem to find missing angles in simple and compound triangles.

  


 
   
 
Learn with visual models
and audio narration
  
 
Common Denominator Lesson
  
 
   
 
Explore interactively and
experiment with changes
  
 
Common Denominator Interactive
  
 
         
 
   
 
Assess understanding with
multiple choice questions
  
 
Common Denominator Questions
  
 
   
 
Apply and connect topic
to the real world
  
 
Common Denominator Applications
  
 

  Standards Correlation  
   

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