Triangle Inequality Theorem Geometry

Triangle Inequality Theorem (V1): Students can use this interactive applet to intuitively and informally discover this theorem.

This is a great way to review the Triangle Sum Theorem. Students look at different triangles and calculate the missing angle in each. They do not need protractors and should use subtraction and addition. This is a great way to review and works wonderfully as a filler activity. There are three sets of worksheets and answer keys are included.

a triangle worksheet with the measurements for triangles and their corresponding numbers on it
a triangle worksheet with the measurements for triangles and their corresponding numbers on it

Triangle Inequality Theorem Examples

Triangle inequality theorem

Triangle Congruence Worksheet Answer Key

Triangle Inequality: Discovery Lesson
Triangle Inequality: Discovery Lesson
Calculating Angles of Triangles (Triangle Sum Theorem)
Calculating Angles of Triangles (Triangle Sum Theorem)

Triangle Inequality Theorem Calculator

This card sort activity is the perfect way for High School geometry students to review the triangle inequality theorem and the Pythagorean theorem.  This card sort activity requires students to use the Triangle Inequality Theorem, Converse of the Pythagorean Theorem, and Pythagorean Inequality Theorems to classify triangles as Acute, Obtuse, Right, or Not a Triangle when given 3 side lengths. This high school geometry activity is so much more fun than a regular free geometry worksheet.

Triangle Worksheets
Triangle Worksheets
Triangle Inequality Theorem Worksheet
Triangle Inequality Theorem Worksheet

Free Triangle Inequality Theorem foldable for Geometry Classroom

Example Of Triangle Inequality Theorem

Triangle Inequality Theorem Worksheet

Inequalities in 1 Triangle: Dynamic & Modifiable Applet

Triangle Congruence Worksheet Answer Key
Triangle Congruence Worksheet Answer Key
Pythagorean & Triangle Inequality Theorems Card Sort
Pythagorean & Triangle Inequality Theorems Card Sort
Triangle Inequality Theorem Foldable
Triangle Inequality Theorem Foldable
Triangle Inequality Theorem Worksheet
Triangle Inequality Theorem Worksheet
Inequalities in 1 Triangle
Inequalities in 1 Triangle
a piece of paper with some writing on it that says, the triangle inequilly
a piece of paper with some writing on it that says, the triangle inequilly
Geometry Worksheets | Triangle Worksheets
Geometry Worksheets | Triangle Worksheets
11 Triangle Inequality Theorem Activities That Rock - Idea Galaxy
11 Triangle Inequality Theorem Activities That Rock - Idea Galaxy
a person sitting at a table with some pencils and rulers on top of it
a person sitting at a table with some pencils and rulers on top of it
Middle School Geometry Lesson: Triangle Discovery Lab
Middle School Geometry Lesson: Triangle Discovery Lab

The Triangle Inequality Theorem Interactive Notebook Page for Geometry

The Triangle Inequality Theorem Worksheets

Check out these 11 activities to get students real world practice with the triangle inequality theorem. This post includes print and go resources, online math tools, challenge questions, and more. Check it out!

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A discovery lab is easy to set up when teaching students the Triangle Inequality Theorem. Gather the following materials: • Various side lengths cut from strips of construction paper. • A recording sheet for students to record observations about side lengths that form a triangle and side lengths that do not form a triangle. Then watch as students make math discoveries. Triangle Inequality Theorem- the sum of the lengths of any two sides of a triangle is greater than the length of the third side.

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