Interactive
Government of Alberta

Learn Alberta: Math Interactives: Exploring Trigonometry (Video Interactive)

For Students 6th - 9th
This multimedia Learn Alberta math resource looks at how trigonometry is used in making sure that airplanes land safely at airports. The accompanying interactive component gives students practice in using trigonometric ratios, namely...
Handout
Other

Mathway: Trigonometry Formulas

For Students 9th - 10th Standards
Resource provides trigonometry formulas for unit circle, reciprocal identities, ratio identities, Pythagorean identities, sum and difference formulas, and double-angle formulas.
Activity
Other

Trigonometry: A Crash Review

For Students 9th - 10th
This site really is a crash review on trigonometry! Formulas, functions - you name it, it's covered! Also includes self quizzes for practice.
Activity
Northeast Parallel Architectures Center, Syracuse University

Npac Reu Program: Trigonometry Review

For Students 9th - 10th
The Northeast Parallel Architectures Center, Syracuse University, provides a review and tutorial site on trigonometry. The information is in-depth and can be accessed by clicking on the various links in the outline.
Activity
Curated OER

Trigonometry Realms

For Students 9th - 10th Standards
Excellent site reviewing the realms of Trigonometry. Topics Include the trig functions, graphs, right triangles and much more.
Activity
Clark University

Clark University: Dave's Short Trig Course: Applications of Trigonometry

For Students 9th - 10th
This Clark University site gives a brief historical perspective into how trigonometry is used in astronomy, geography, engineering, physics, and mathematics.
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Practice Problems: Right Angle Trigonometry

For Students 9th - 10th Standards
Fourteen problems present practice working with right angle trigonometry. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the "View Solution" button to check...
Website
Oswego City School District

Regents Exam Prep Center: Teaching Strategies for Algebra 2 & Trigonometry

For Students 9th - 10th
The mathematics lesson plans consist of teaching strategies and activities for algebra, geometry, and trigonometry. Some strategies included are teaching in block scheduling, working with lower ability students, and planning curriculum....
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Practice Problems: Right Triangles and Trigonometry

For Students 9th - 10th Standards
Twenty-five problems cover the topic of right triangles and trigonometry in different settings. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the "View...
Lesson Plan
TeachEngineering

Teach Engineering: Handheld Trigonometry

For Teachers 9th - 10th Standards
In addition to understanding the concept of similar right triangles and how they apply to trigonometric ratios, students explore a clinometer app, and discover how it can be used to test the mathematics underpinning trigonometry.
eBook
Mathigon

Mathigon: Geometry: Triangles and Trigonometry: Trigonometry

For Students 9th - 10th
This lesson focuses on trigonometry including the trigonometric functions: sine, cosine, and tangent.
Unit Plan
CK-12 Foundation

Ck 12: Flex Book: Trigonometry

For Teachers 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Six-chapter book that introduces students to trigonometry. Topics include right angles, circular functions, trigonometric identities, vectors, and polar equations.
Handout
Cuemath

Cuemath: Trigonometry

For Students 9th - 10th Standards
A comprehensive guide for learning all about the basics of trigonometry, the various identities-formulas of trigonometry, solved examples, and practice questions.
Activity
Lawrence Hall of Science

The Math Page: Trigonometry

For Students 9th - 10th Standards
Concepts in Trigonometry are explained and illustrated here by a member of the math department at Borough of Manhattan Community College.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Trigonometry Word Problems

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Use trigonometry to solve word problems.
Unit Plan
CK-12 Foundation

Ck 12: Trigonometry: Heron's Formula

For Students 10th - 12th
[Free Registration/Login may be required to access all resource tools.] This lesson covers Heron's Formula and problem solving using trigonometry.
Handout
Math Is Fun

Math Is Fun: Introduction to Trigonometry

For Students 9th - 10th Standards
Students are introduced to concepts taught in trigonometry. The tutorial consists of notes and examples.
Activity
Math Is Fun

Math Is Fun: Trigonometry

For Students 9th - 10th Standards
Students explore trigonometry concepts through this collection of definitions, lessons, examples problem-solving steps and strategies, and practice problems. Topics include solving triangles, trigonometric functions, theorems, and the...
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...
Activity
Other

Gcse Answers' Easy Start Trigonometry

For Students 9th - 10th
Some basic questions dealing with everyday situations where trigonometry is needed to solve the problem. Click a button for the solutions.
Unit Plan
Khan Academy

Khan Academy: Trigonometry

For Students 9th - 10th
Reviews the basics of trigonometry and how its concepts are instrumental in computer graphics programming.
Activity
National Council of Teachers of Mathematics

The Math Forum: High School Archive for Trigonometry

For Students 9th - 10th
This site from the Math Forum with Dr. Math is an excellent site with answers to submitted questions on trigonometry. In addition the student can submit their own questions. Links are provided for additional information.
Activity
Other

Math Mistakes: Common Trigonometry Mistakes

For Students 9th - 10th
Learn from other student's mistakes by reviewing examples of the following Trigonometry topics: values of trigonometric functions, values of inverse trigonometric functions, solving triangles, simplifying trigonometric expressions, and...
Activity
Texas Instruments

Texas Instruments: Basic Trigonometry

For Teachers 9th - 10th
Students will define basic terms relating to trigonometry and use trigonometric ratios.

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