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Activity
University of Cambridge

University of Cambridge: Nrich: Triangles to Tetrahedra

For Students 3rd - 8th Standards
Given an unlimited number of a specific type of equilateral, isosceles, and right triangles create as many tetrahedra as are possible. Includes printout.
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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.] This lesson applies the trigonometric ratios and their inverses to real-life situations.
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Unit Plan
Other

Algebra Lab: Word Lesson: Vectors Right Triangles Components and Resultants

For Students 9th - 10th Standards
Solve problems using vectors that involve velocity, speed, direction, and magnitude. Includes examples and practice problems. Click on the buttons under the practice questions to see the solutions.
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Unit Plan
Ministry of Education and Universities of the Region of Murcia (Spain)

Ministerio De Educacion Y Ciencia: Introduccion a La Trigonometria

For Students 9th - 10th Standards
This is an interactive activity introducing the concept of trigonometry and working with trigonometric functions to solve right triangles.
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Unit Plan
Texas Education Agency

Texas Gateway: Applying Pythagorean Triples to Solve Problems

For Students 9th - 10th
Given verbal and pictorial representations of problem situations, the student will apply patterns from right triangles whose sides are Pythagorean Triples to solve the problems.
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Activity
Other

Trig Without Tears: Solving Triangles

For Students 9th - 10th Standards
This page provides a good explanation of how to solve oblique triangles (triangles containing no right angles.) The Law of Cosines section is about halfway of the way down the page.
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Unit Plan
CK-12 Foundation

Ck 12: Algebra: Solving Equations Using the Pythagorean Theorem

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Use the Pythagorean Theorem to find a right triangle's missing side lengths.
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Unit Plan
Cuemath

Cuemath: Altitude of a Triangle

For Students 9th - 10th Standards
Explore the world of the altitude of a triangle in this mini-lesson including its definition, altitudes in different types of triangles, formulae, some solved examples, and a few interactive questions for you to test your understanding.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Inscribed Similar Triangles

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to apply similarity to solve for missing information in inscribed right triangles.
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Unit Plan
CK-12 Foundation

Ck 12: Algebra: Solving Equations Using the Pythagorean Theorem

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] Use the Pythagorean Theorem to find a right triangle's missing side lengths.
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Unknown Type
Khan Academy

Khan Academy: Solve Triangles Using the Law of Cosines

For Students 9th - 10th Standards
Solve missing triangle measures using the law of cosines. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Lesson Plan
PBS

Pbs Learning Media: Triangles: Targeted Math Instruction

For Students 9th - 10th Standards
Students will learn how to apply the properties and characteristics of all triangles to solve real-world problems and identify and use the unique characteristics of right, isosceles, equilateral, acute, obtuse, and scalene triangles.
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Activity
Analyze Math

Analyze Math: Triangle Problems

For Students 9th - 10th Standards
Here are five triangle problems to solve using the Law of Sines, Law of Cosines, Pythagorean Theorem, and trigonometry. All problems have detailed written solutions included.
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Activity
TeachEngineering

Teach Engineering: You've Got Triangles!

For Teachers 6th - 8th
Students learn about trigonometry, geometry and measurements while participating in a hands-on interaction with LEGO MINDSTORMS NXT technology. First they review fundamental geometrical and trigonometric concepts. Then, they estimate the...
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Unknown Type
Khan Academy

Khan Academy: General Triangle Word Problems

For Students 9th - 10th Standards
Solve word problems that involve general triangles using trigonometry. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Handout
Purple Math

Purplemath: Basic Trigonometric Ratios: Examples

For Students 9th - 10th Standards
Demonstrates how to use trig ratios to do simple solving of triangles.
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Unit Plan
CK-12 Foundation

Ck 12: Algebra: Solving Equations Using the Pythagorean Theorem

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] Use the Pythagorean Theorem to find a right triangle's missing side lengths.
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Activity
Maths Challenge

Maths challenge.net: Leaning Ladders

For Students 9th - 10th Standards
Use your right triangle solving skills to solve this ladders in a hole problem.
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Activity
Texas Instruments

Texas Instruments: Real Life Real World Activity Forestry

For Teachers 9th - 10th
Forest industry professionals make measurements in their work using tools including the Clinometer and the Biltmore Stick. These tools are based on the concepts of similar triangles and trigonometric ratios in a right triangle. This...
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Interactive
Government of Alberta

Learn Alberta: Math Interactives: Exploring Square Roots Video

For Students 6th - 8th Standards
This video illustrates the concepts of square roots, slope, and the Pythagorean Theorem as they are used in designing and constructing skate park rails, ramps, and pipes. An interactive activity is also included where students are able...
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Interactive
National Council of Teachers of Mathematics

Nctm: Illuminations: Tube Viewer Simulation

For Students 9th - 10th
A computer simulation of viewing through various lengths of tubes at different distances. The simulation also has an exploration of focus questions. [Requires Java.]
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Unit Plan
Khan Academy

Khan Academy: Right Triangle Trigonometry Review

For Students 9th - 10th
Review right triangle trigonometry and how to use it to solve problems.
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Activity
Texas Instruments

Texas Instruments: Cottage Water Problem

For Teachers 9th - 10th
Students use the Cabri Geometry II Plus software to solve a geometry problem. They move the vertex point that is common to two right triangles along the base to find the smallest possible sum of the length of the hypotenuse.
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Srt Shortest Line Segment From a Point P to a Line L

For Teachers 9th - 10th Standards
For this task, students develop an understanding that the shortest path from a point to a line always meets the line at a right angle. Aligns with G-SRT.C.8.

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