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Unit Plan
Lawrence Hall of Science

The Math Page: Skill in Algebra: The Pythagorean Theorem

For Students 9th - 10th
Here is a site that clearly and thoroughly explains the Pythagorean Theorem from solving for missing sides of a right triangle through its proof. There are example problems solved, problems for the student to attempt, and answers to the...
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Unknown Type
OER Commons

Oer Commons: Pre Assessment

For Teachers 6th - 8th Standards
Students solve for missing angle measures by applying what they have learned about types of angles and the angle measures of polygons. Students do a pre-assessment at the end of the lesson.
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Graphic
Curated OER

Webmath: Find Out Things About a Right Triangle

For Students 9th - 10th
Gives basic info about a right triangle. Also students can substitute values for sides or angles in order to find missing values. The method for solving is then explained.
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Gpe.5 Triangles Inscribed in Circle

For Teachers 9th - 10th Standards
In this task, students use ideas about linear functions to determine when certain angles are right angles. They use the fact that two lines (if not vertical or horizontal) are perpendicular when their slopes are inverse reciprocals, as...
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Activity
Maths Challenge

Maths challenge.net: Right Time

For Students 9th - 10th
You will need to do some visualizing to solve this "Right Time" problem. Have fun!
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Activity
University of Cambridge

University of Cambridge: Nrich: Tessellating Triangles

For Students 3rd - 8th
The challenge at this one page website, involves tessellation and triangle. Should you accept this challenge, you will find helpful teacher notes and the solution available right at the website.
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Handout
Geometry Help

Geometry Help: Pythagorean Theorem

For Students 9th - 10th Standards
Explains the basic concept of the Pythagorean Theorem with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
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Unit Plan
Cuemath

Cuemath: Pythagoras Theorem

For Students 9th - 10th Standards
In this lesson, you will learn about the Pythagoras theorem, its derivations, and equations followed by solved real-world problems on the Pythagoras theorem triangle and squares.
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Graphic
Curated OER

Zona Land: Trigonometry Right Triangles

For Students 9th - 10th
Introduction to right triangles and how to solve them using trigonometric functions. Very nice interactive demonstration of what happens when the angle measurements change and how it effects the calculations. This visual might be just...
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Graphic
Curated OER

Zona Land: Trigonometry Right Triangles

For Students 9th - 10th
Introduction to right triangles and how to solve them using trigonometric functions. Very nice interactive demonstration of what happens when the angle measurements change and how it effects the calculations. This visual might be just...
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Graphic
Curated OER

Zona Land: Trigonometry Right Triangles

For Students 9th - 10th
Introduction to right triangles and how to solve them using trigonometric functions. Very nice interactive demonstration of what happens when the angle measurements change and how it effects the calculations. This visual might be just...
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Graphic
Curated OER

Zona Land: Trigonometry Right Triangles

For Students 9th - 10th
Introduction to right triangles and how to solve them using trigonometric functions. Very nice interactive demonstration of what happens when the angle measurements change and how it effects the calculations. This visual might be just...
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Inverse Trigonometric Ratios

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept teaches students to use inverse trigonometric ratios to solve for missing angles in right triangles.
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Activity
Texas Instruments

Texas Instruments: Real Life Real World Activity Carpentry

For Teachers 9th - 10th Standards
Carpenters use applications of geometry in their work, including the properties of right triangles and circles. This activity uses Cabri Jr. Geometry software to make measurements and solve problems based on carpentry situations....
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Activity
Lawrence Hall of Science

The Math Page: Trigonometry: Trig Functions of an Acute Angle

For Students 9th - 10th Standards
Here is a site that clearly and thoroughly explains the trigonometric functions of acute angles within a right triangle. There are example problems solved, problems for the student to attempt, and answers to the student problems. Point...
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Laws of Sines and Cosines

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept teaches students to find missing sides and angles in non-right triangles using the Laws of Sines and Cosines.
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Activity
Maths Challenge

Maths challenge.net: Corner Circle

For Students 9th - 10th Standards
This is a "three star" geometry problem where prior knowledge of circles and triangles is recommended to solve this circle in the corner problem.
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Unit Plan
CK-12 Foundation

Ck 12: Trigonometry: Law of Sines

For Students 10th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] Learn how to use the Law of Sines with different types of triangles.
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Lesson Plan
Alabama Learning Exchange

Alex: The Pythagorean Theorem in the Real World

For Teachers 9th - 10th Standards
The introduction of this lesson has students verifying the famous Pythagorean Theorem with a hands-on proof. Students will then apply the Theorem in one of two ways: by solving for the side lengths of a right triangle and by determining...
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Srt, G Mg How Far Is the Horizon?

For Teachers 9th - 10th Standards
Some friends are at the beach looking out onto the ocean on a clear day and they wonder how far away the horizon is. A second problem asks how far the horizon would be from the top of a mountain. Students must also answer a question...
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Unknown Type
Khan Academy

Khan Academy: Pythagorean Theorem Word Problems

For Students 7th - 8th
Use the Pythagorean theorem to solve word problems. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
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Unknown Type
Khan Academy

Khan Academy: Use Area of Squares to Visualize Pythagorean Theorem

For Students 7th - 8th Standards
Apply the Pythagorean theorem and its converse to solve these problems. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
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Activity
University of Cambridge

University of Cambridge: Nrich: Disappearing Square

For Students 9th - 10th Standards
This one page website explains how to find the area of a triangle with an interactive graphic. It then offers a challenge. The solution is available right at the website.
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Activity
University of Cambridge

University of Cambridge: Nrich: Magic Triangle

For Students 3rd - 8th
Use your problems solving skills to make everything add up correctly for this challenge. The solution is right at this one page website.

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