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Lesson Plan
Curated OER

Worksheet 7: Slope and Tangents

For Teachers 12th - Higher Ed
Providing both review and practice problems, this worksheet prompts students to answer five questions having to do with slope, tangents lines, graphing, the Squeeze Theorem, differentiable functions and derivatives. This activity could...
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Lesson Plan
Curated OER

Which Triangles are Right

For Teachers 9th - 10th
Students apply properties of right triangles to solve problems. In this geometry lesson plan, students identify axioms and theorems using examples.
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Worksheet
Curated OER

Triangle Inequalities

For Students 9th - 10th
In this geometry worksheet, students use the inequality theorem to figure out if three segments will make a triangle. They are given the measures of two segments and must figure out the third segment on their own. There are 20 questions.
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Lesson Plan
Curated OER

Indirect Proof and Inequalities in One Triangle

For Teachers 10th
For this geometry worksheet, 10th graders order the sides and angles of a triangle and determine the range of the third side of a triangle given the lengths of two sides.  The one page worksheet contains sixteen questions.  Answers are...
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Lesson Plan
Curated OER

Exploring the Hinge Theorem

For Teachers 9th - 10th
Students explore the application of Hinge Theorem. In this geometry lesson, students write inequalities, given two sides of a triangle. They solve problems with triangular inequalities using the proper theorem.
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Lesson Plan
Curated OER

Triangle Conjectures

For Teachers 10th
Tenth graders investigate the theorems of ASA, AAS, AAA and ASA. In this geometry lesson, 10th graders discuss the theorems of triangles and how it is used to solve for missing sides or angles. They review how two angles are formed by...
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Worksheet
Curated OER

Triangles

For Students 10th
In this geometry worksheet, 10th graders solve problems involving triangular inequality. They apply the proofs and theorem of triangles to solve these problems. There is an overview and one question.
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Printables
Virginia Department of Education

High School Mathematics Geometry Vocabulary Word Wall Cards

For Teachers 9th - 10th
Having a good working knowledge of math vocabulary is especially important for geometry learners. Here are 119 pages worth of wonderfully constructed definitions, constructions, formulas, properties, theorems, and postulates. This is a...
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Lesson Plan
Curated OER

Angle-Side Relationships

For Teachers 9th - 12th
Students calculate the different sides and angles of a triangle. In this geometry lesson, students use triangular properties to define the relationship between two triangle. They identify missing angles using the interior angle theorem.
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Lesson Plan
Curated OER

Geometric Patterns

For Teachers 7th - 8th
Students explore geometric patterns. Given three straws of various sizes, students conduct tests, and search for patterns, to determine if the various sizes would form a triangle. They use the Triangle Inequality Theorem to determine...
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Worksheet
Curated OER

Properties of Geometry

For Students 10th
In this properties of geometry worksheet, 10th graders solve and complete 12 different problems that include various theorems. First, they draw a figure that illustrates the SAS inequality property. Then, students prove that two line...
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Unit Plan
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Mathematics Vision Project

Module 3: Polynomial Functions

For Students 9th - 12th Standards
An informative module highlights eight polynomial concepts. Learners work with polynomial functions, expressions, and equations through graphing, simplifying, and solving. 
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Lesson Plan
Curated OER

CSI Investigation of Congruence and Similarity

For Teachers 9th - 12th
Students differentiate between similarity and congruence using polygons. In this geometry instructional activity, students label triangles based on their properties. They find missing sides and angles using the interior sum theorem.
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Printables
Virginia Department of Education

Middle School Mathematics Vocabulary Word Wall Cards

For Teachers 5th - 9th
Having a good working knowledge of math vocabulary is so important for learners as they progress through different levels of mathematical learning. Here is 125 pages worth of wonderfully constructed vocabulary and concept review cards....
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Lesson Plan
Curated OER

Geometry Jeopardy

For Teachers 9th - 11th
Learners identify the pattern in a problem. In this geometry lesson, students make predictions, collect and analyze data. They apply the idea of scales and measurements to the real world.
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Unit Plan
Cuemath

Cuemath: Triangle Inequality Theorem

For Students 9th - 10th
This lesson explores triangle inequality theorem, triangle inequality theorem-proof, and triangle inequality theorem problems. Try the hands-on triangle inequality theorem calculator and interactive problems to have a better...
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Inequality Theorem

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This concept teaches students the Triangle Inequality Theorem and how to apply it.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Inequality Theorem

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Apply the Triangle Inequality Theorem to determine if three side lengths make a triangle.
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Unit Plan
Oswego City School District

Regents Exam Prep Center: Triangle Inequality Theorems

For Students 9th - 10th Standards
This tutorial discusses triangle inequality and provides practice problems for students to try out their skills. The teacher resource page contains a lesson plan for a yummy activity involving licorice.
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Activity
Texas Instruments

Texas Instruments: Triangle Inequality Theorem

For Teachers 9th - 10th
In this activity, students will explore the concepts underlying the Triangle Inequality Theorem by comparing side lengths and angle measures of a triangle. They will use an interactive construction to see why this theorem is true.
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Handout
Math Open Reference

Math Open Reference: Triangle Inequality Theorem

For Students 9th - 10th
Explore the triangle inequality theorem with this helpful reference tool. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
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Handout
University of Georgia

University of Georgia: Inter Math: Triangle Inequality

For Students 9th - 10th
This site has a description of the triangle inequality theorem along with a visual representation, and animation explaining the triangle inequality rule with the radii of circles at the segment endpoints. Links to related terms, more...
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Handout
Math Open Reference

Math Open Reference: Triangle Inequality Theorem Converse

For Students 9th - 10th
Learn about the Triangle Inequality Theorem Converse with this helpful reference tool. Provides a definition and interactive that enhance further explanation. Includes links to related topics.
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Activity
Texas Instruments

Texas Instruments: Triangle Inequality

For Teachers 9th - 10th
In this activity the Students can use Cabri Jr. to investigate the Triangle Inequality Theorm and make conjectures about their findings.