Triangle Sum Theorem and Special Triangles

Unit 7: Discovering and Proving Triangle Properties
Lesson 2 of 10

Objective: Students will be able to discover and prove the triangle sum theorem.

Big Idea: By investigating the angles of four different types of triangles, students conjecture about the interior angle sum of triangles and ultimately prove the triangle sum theorem.

  Print Lesson
7 teachers like this lesson
Subject(s):
Math, Geometry, Triangles, reasoning and proof, Triangle Sum Theorem, Triangle Congruence, triangle similarity
  85 minutes
triangle sum cropped image 1
 
1
2
3
4
5
Similar Lessons
 
Applying Triangle Congruence
Geometry » Triangles and Congruence
Big Idea: Students learn how proving triangles congruent can be used as part of a larger strategy in a proof.
  Favorites(4)
  Resources(18)
Ault, CO
Environment: Rural
Tom Chandler
 
Time for Triangles
Geometry » Tremendous Triangles
Big Idea: Students will measure, cut and measure again to learn and prove key properties of triangles
  Favorites(3)
  Resources(28)
Saratoga Springs, NY
Environment: Suburban
Stephanie Conklin
 
Prove It (Part 1)
Geometry » Similar and Right Triangles
Big Idea: Students work on proving hypotheses – and end up proving the Pythagorean Theorem.
  Favorites(0)
  Resources(11)
Amsterdam, NY
Environment: Urban
Beth Menzie
 
Something went wrong. See details for more info
Nothing to upload
details
close