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88 reviewed resources for triangle inequality

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Lesson Planet

Triangle Inequality Theorem: Lesson

For Students 6th - 12th Standards
Can any three lengths make a triangle? One of the videos in a playlist on basic geometry introduces the Triangle Inequality Theorem. Using three given lengths, the presentation illustrates the restrictions on lengths of any side of a...
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To Be a Triangle Or Not To Be a Triangle?

For Students 10th
In this triangles activity, 10th graders solve and complete 10 different problems that include applying the Triangle Inequality Theorem. First, they use the illustrated triangles and the data table to test the theorem. Then, students use...
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Triangle Inequality Task

For Teachers 9th - 12th Standards
Not all triangles are created equal. A simple hands-on activity has learners investigate the side lengths of triangles. They use pipe cleaners to determine whether triangles of given side lengths can exist and then use the results to...
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Art or Junk? Discovering the Triangle Inequality

For Teachers 6th
Middle schoolers study the triangle inequality. They will identify, compare, and analyze attributes of two and three-dimensional shapes. Then they develop vocabulary to describe the attributes. They also use manipulatives to analyze the...
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Countdown Challenge: Triangle Inequality Theorem

For Students 7th - 8th
In this triangle inequality worksheet, students test the Triangle Inequality Theorem. They measure the sides of given triangles, identify the type of triangle, and name angles in the triangle. The one-page worksheet contains 36 problems.
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Solving Problems Using Triangle Inequality Theorem

For Teachers 6th
Sixth graders investigate triangles and the inequality theorem. They will collaborate in groups to determine the length of a longest side of a triangle. Then relate the size of the triangle to its angles using protractors, yard sticks,...
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Triangle Inequality Theorems Investigation

For Teachers 9th - 10th
Learners estimate and measure triangles. In this geometry lesson, students identify the relationship between three sides and a triangle. They use the inequality theorem to decide if a triangle will be formed or not.
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Triangle Inequality

For Teachers 4th - 6th
Students discover that the sum of the lengths of any two sides of a triangle must be greater than the third side. They are shown how a triangle is formed using three strips such as that the triangle is seen inside the strips.
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Triangle Inequality

For Teachers 6th - 8th Standards
This STEM lesson plan presents a guided inquiry-based activity on exploring the relationship between the side lengths of a triangle. Class members are encouraged to also find the relationship between angle measure and side lengths....
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Proving the Triangle Inequality Theorem

For Students 9th - 12th Standards
Find out how triangles are inherently unequal. A proof of the Triangle Inequality Theorem is the task at hand. Scholars apply previously learned theorems to write this proof.
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How Many Triangles?

For Teachers 9th - 11th Standards
Something for young mathematicians to remember: the sum of any two sides must be greater than the third. Class members investigates the Triangle Inequality Theorem to find the relationship between the sides of a triangle. At the same...
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Indirect Proof and Inequalities in one Triangle

For Teachers 10th
In this geometry worksheet, 10th graders complete an indirect proof and order the sides or angles of a triangle. Also, students determine if a triangle can have sides with the given lengths. The two page worksheet contains twelve...
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Triangle Inequality Theorem

For Teachers 9th - 12th Standards
High schoolers investigate the relationship between angle measures and sides of a triangle and the relationships among the three sides of a triangle. The use of technology (Cabri, Jr.) allows learners to make and test conjectures as they...
Lesson Planet

Geometer Sherlock: Triangle Investigations

For Teachers 8th - 10th Standards
Deduce quite elementary relationships within triangles. Small groups work through three investigations of triangles. The investigations use patty paper to determine the Triangle Sum Theorem and the relationship between the angle size and...
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How Many Triangles?

For Teachers 9th - 12th
Learners apply the triangle inequality.  In this applying the triangle inequality lesson, students determine how many triangles can be constructed given 6 rods of different lengths.  Learners determine the number of triangles by applying...
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Quiz: Triangle Inequality Theorem

For Students 7th - 8th
In this triangle inequality theorem worksheet, students determine the lengths of the sides of triangles and identify the measure of angles. This one-page worksheet contains ten triangle theorem problems.
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Triangle Inequalities Homework

For Students 10th - 11th
In this geometry worksheet, students solve problems based on the triangle inequality theorem(s) in which determine if the given lengths can form a triangle, given two sides of a triangle determine the range of the third side, and order...
Lesson Planet

Toothpick Triangles

For Teachers 4th - 8th
Students draw a chart (included in the lesson) to use with their investigation. They review terminology of triangles and receive toothpicks to use in the lesson. Beginning with three toothpicks, students form a triangle. They complete...
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Pythagorean Theorem to Classify Triangles: Missing Angles

For Students 8th - 12th Standards
Learn to use the Pythagorean Theorem with non-right triangles. Pupils use the interactive to discover the relationship between the lengths of sides for acute and obtuse triangles. They compare the squares of the sides of the triangles to...
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Triangle Inequality Theorem

For Teachers 8th - 10th
Students use the inequality theorem to solve triangles and their properties. In this geometry instructional activity, students are given spaghetti of different lengths and asked to create triangles. They conclude the necessary length...
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Inequalities and Triangles

For Teachers 9th - 10th
Students prove and apply theorems of triangle inequality and hinge theorem. In this geometry lesson, students will discuss which triangle is bigger and why. They will use theorems, such as Exterior Angle Inequality or the Pythagorean...
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Inequalities in a Triangle

For Students 9th - 12th Standards
Stuck with triangle proofs? Take a 180° and provide learners with a guided worksheet that tests their knowledge with triangle inequalities. The questions require different types of proofs that range in levels of difficulty. 
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Working with the TI-Nspire to Discover the Triangle Inequality Theorem

For Teachers 10th
Tenth graders explore triangles.  In this geometry lesson, 10th graders use Ti-Nspire to explore the relationships between the lengths of the sides of a triangle.   The dynamic nature of TI-Nspire assists students as they investigate and...
Lesson Planet

Triangle Inequality Theorem

For Teachers 7th - 9th
Students identify properties of triangles. In this geometry lesson, students create triangles using three different segments. They make conjectures and predictions.

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