Triangle Sum Theorem Inquiry Activity Lesson Pack

Math Giraffe
Grade Levels
7th - 10th
Formats Included
  • Zip
26 plus answer keys & directions
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Math Giraffe


Triangle Sum Theorem Exploration- Students discover that the sum of the angle measures in a triangle is 180 degrees.

Here's what's included in in this great lesson pack:

- A review of triangle classifications

- 2 half-sheet Warm-Up exercises

- 2 different versions of a discovery worksheet for Triangle Sum Theorem

- A quick cut-up activity for investigating Triangle Sum Theorem

- A short presentation in a separate PDF file

- An organizer to record the theorem (in a diagram with math language and in the student’s own words) and provide examples of possible and impossible triangles based on the theorem

- A small exit slip for Triangle Sum Theorem

-2 worksheets for practicing Triangle Sum Theorem (one basic, one with algebra applications)

- A short quiz (2 pages)

- Answer Keys

*** Note: This activity is also included in a larger DISCOUNTED bundle:

Triangles Bundle

Materials Required:



-ruler or other straightedge

Please look at the preview file for a look at what's included. Some of the problems require solving equations that may be a challenge for middle schoolers. These can be skipped, but please verify that most of this is appropriate for your own class and their skills.

Try these other discovery based Math Giraffe inquiry activities next:

Exterior Angles Inquiry Activity

Discovering Triangle Inequality Theorem

Triangle Classification and Impossible Triangles

Total Pages
26 plus answer keys & directions
Answer Key
Teaching Duration
4 days
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