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Solve problems using the Triangle Inequality Theorem. SPI 0606.4.3

1. Discover the Triangle Inequality Theorem - a four-page lesson plan designed for 7th grade, a data sheet is included
2. Inequalities in Triangles - [designed for high school students] Students use pasta to create models of triangles and non-triangles and investigate the relationship between the longest side of the triangle and the sum of the other two sides of the triangle in this Illuminations lesson plan from NCTM
1. Inequality Activity Sheet - to accompany the above lesson
3. Licorice Triangles - a teaching idea using licorice shoe laces, and rulers [This expired page is brought to you by the Internet archive, the Wayback Machine.]
4. Practice with Triangle Inequality - five multiple choice questions with explanation [This expired page is brought to you by the Internet archive, the Wayback Machine.]
5. Triangle Inequalities - explanation from the Regents Prep assessment prep site
6. The Triangle Inequality Theorem - explanation that any side of a triangle is always shorter than the sum of the other two sides – includes an interactive java applet or
7. Triangle Inequality Theorem - with worked solutions and a video

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