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Lesson Plan
Curated OER

Calculating the shortest distance between two points

For Teachers 8th
Eighth graders find the length of the third side of a right triangle.
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Unknown Type
McGraw Hill

Glencoe: Self Check Quizzes the Pythagorean Theorem

For Students 6th - 8th Standards
Students answer multiple choice questions about the Pythagorean Theorem. The questions questions are self-checking and hints are provided.
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Activity
AAA Math

Aaa Math: Types of Triangles Based on Angles

For Students 3rd - 5th Standards
Students can practice classifying triangles based on angle measurements through a series of self-check exercises and timed learning games.
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Activity
Homeschool Math

Homeschool Math: Triangles

For Students 3rd - 8th Standards
This lesson plan provides students with an opportunity to practice drawing and measuring triangles and angles. It also shows pictures and gives definitions of each type of angle and triangle.
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Unit Plan
CK-12 Foundation

Ck 12: Trigonometry: Pythagorean Theorem for Solving Right Triangles

For Students 10th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] Finding unknown sides in a triangle using other sides and angles.
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Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Determine Unknown Angles: Isosceles, Scalene, Right Triangles

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] Students watch a video and attempt practice problems on finding the missing angles in triangles.
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Activity
Lawrence Hall of Science

The Math Page: Trigonometry: Solve Right Triangles

For Students 9th - 10th Standards
Here is a site that clearly and thoroughly explains how to solve right triangles for any missing side or angle given any two pieces other sides or angles. There are example problems solved, problems for the student to attempt, and...
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Activity
Lawrence Hall of Science

The Math Page: Trigonometry: Trignometry of Right Triangles

For Students 9th - 10th Standards
Here is a site that clearly and thoroughly explains the trigonometry of a right triangle, including finding the values of all six trig functions given a single value. There are example problems solved, problems for the student to...
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Unit Plan
BBC

Bbc: Pythagoras' Theorem

For Students 6th - 8th Standards
You can pick up some valuable pointers on how to apply the Pythagorean Theorem here. When you finish working your way through the pages you can take an on-line "Test Bite," and check your understanding.
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Unit Plan
CK-12 Foundation

Ck 12: Right Triangles, Bearings, and Other Applications

For Students 10th - 12th
[Free Registration/Login may be required to access all resource tools.] Find distances using angles expressed as bearings. Here you'll learn how to relate right triangle relationships to course bearings.
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eBook
CK-12 Foundation

Ck 12: Algebra Ii: 4.2 Right Triangle Trig Extended to Circles With a Model

For Students 9th - 10th Standards
This section explores the relationship between right triangles, circles, and trigonometry. It investigates how a right triangle that is set inside a circle and rotates around the circle is connected to trigonometric functions and their...
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eBook
CK-12 Foundation

Ck 12: Algebra Ii: 4.1 Revisiting Right Triangle Trigonometry

For Students 9th - 10th Standards
Use this tutorial to revisit right triangle trigonometry.
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eBook
CK-12 Foundation

Ck 12: Algebra Ii: 4.8 Pythagorean Identities

For Students 9th - 10th Standards
This section explores the Pythagorean Identity and how it applies to right triangles set inside unit circles, in terms of sine, cosine, and tangent functions.
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Handout
Purple Math

Purplemath: Right Triangle Word Problems

For Students 9th - 10th
Demonstrates how to translate, set up, and solve basic right-triangle word problems.
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Activity
Pennsylvania State University

Pennsylvania State Univ.: Trilingual Packaging Dilemma

For Students 9th - 10th Standards
This site from the Pennsylvania State University provides a hands-on activity to bridge the gap between right triangles, 30-60-90 and 45-45-90 theorems, and trigonometry, and what every student wants to know, "When will I ever use this?"...