Reflection: Advanced Students Triangle Inequality Theorem Investigation - Section 2: Activity Introduction


This year my students were well prepared to use this concept. As an alternative activity I gave out whole pipe cleaners to students. These students folded the pipe cleaner in two places and measured the lengths formed. This task is more complex since students have continuous measurements instead of discrete measurements. I had these students measure in centimeters instead of inches.

In general, I prefer students to measure in centimeters. Students who don't fully understand measuring will often write inches as decimals instead of mixed numbers. Measurements in centimeters are precise to one decimal place. I used inches in the original activity because the numbers 1, 2, 3, 4, and 6 are easier to work with then corresponding lengths in centimeters. 

  Alternate Activity
  Advanced Students: Alternate Activity
Loading resource...

Triangle Inequality Theorem Investigation

Unit 7: Proofs about Triangles
Lesson 1 of 11

Objective: SWBAT Describe the relationship between the sides of a triangle

Big Idea: Students investigate and make conclusions about sets of potential sides of triangles in order to discover the triangle inequality theorem.

  Print Lesson
16 teachers like this lesson
  45 minutes
triangle inequality image
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.
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
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.
Amsterdam, NY
Environment: Urban
Beth Menzie
Something went wrong. See details for more info
Nothing to upload