Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Right Triangles and Trigonometry
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...
BBC
Bbc: Gcse Bitesize: Sine and Cosine Rules
BBC provides a three part lesson on solving triangles, by using the sine rule and cosine rule.
Oswego City School District
Regents Exam Prep Center: Law of Sines and Law of Cosines
This tutorial examines the law of sines and the law of cosines. Includes class notes, examples, and a variety of practice problems with solutions. The teacher resource consists of a lab that utilizes the law of sines and the law of cosines.
Cuemath
Cuemath: Law of Cosine
Explore the world of the Law of Cosine in this mini-lesson. Provides a definition, simulations, examples, and practice questions that help with understanding.
Cuemath
Cuemath: Sine Law
This comprehensive guide explores the topic of sine law, by finding answers to questions like what is the law of sines, what are the applications of sine law, and proof of the sine law. Includes solved examples and practice questions.
Georgia State University
Georgia State University: Hyper Physics: Laws of Sines and Cosines
At the bottom of this page from the Georgia State University, you will two real-world applications of the Laws of Sines and Cosines (in the context of velocity vectors.)
Curated OER
Zona Land: Trigonometry, Right Triangles
This site provides information on sine, cosine, and tangent. Lengths of the sides are discussed and many diagrams/tables are shown.
Windstream
Ojk's Precalculus Study Page: The Law of Cosines
An introduction to solving acute and obtuse triangles by using the law of cosines, including a derivation of the formula. Includes several pistures and examples.
Wolfram Research
Wolfram Math World: Law of Cosines
This page from MathWorld.com gives a good explanation of the Law of Cosines, which relates the lengths of the legs of a triangle to the angles. This site shows how the formula is derived, along with a triangle to clarify variables. Also...
Texas Instruments
Texas Instruments: Numb3 Rs: To Pythagoras and Beyond
Based off of the hit television show NUMB3RS, this lesson has students discover the Pythagorean relationships of different triangle types. By the end of the lesson, students should be able to take three given side lengths and compute...
Texas Instruments
Texas Instruments: Math Today When a Ruler Isn't Enough
This activity illustrates a real-life problem that uses trigonometry to solve for an unknown. students can use trigonometric ratios and inverse trigonometric relationships to determine the side of a triangle and the measure of the...
Texas Instruments
Texas Instruments: Sin, Cos, and Tan of Right Triangles
In this activity, students explore a right angled triangle and its trigonometric concepts. They investigate the trigonometric ratios for the angles of the triangle.
Texas Instruments
Texas Instruments: What's the Trig?
Students will be introduced to right triangle trigonometry. They will use the TI-89 and Geometer's Sketchpad to construct a right triangle and calculate sin, cosine, and tangent of various acute angles.
Texas Instruments
Texas Instruments: Discover Law of Sines
Using Cabri Jr students will be able to visualize the umbiguous case as well as when one cannot create a triangle.
Analyze Math
Analyze Math: Sine Law Problems
Here are six problems to solve using the Law of Sines. One of the problems addresses the ambiguous case. Four have detailed solutions; two have answers given only. Notice the link at the bottom that takes you to a Law of Sines calculator...
Other
Trig Without Tears: Solving Triangles
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.
Math Planet
Math Planet: Algebra 2: Sines
Defines and examines the law of sines through examples and a video lesson. [2:02]
Math Planet
Math Planet: Algebra 2: Cosines
Defines and explores the law of cosines through examples and a video lesson. [1:41]
McGraw Hill
Glencoe Mathematics: Online Study Tools: Quiz on Solving Right Triangles
Learners demonstrate comprehension of advanced mathematical concepts in Trigonometry. The questions check understanding on the topic of solving right triangles.
McGraw Hill
Glencoe Mathematics: Online Study Tools: Self Check Quiz on the Law of Sines
The online assessment demonstrates knowledge of Algebra II. The questions test students on the law of sines.
McGraw Hill
Glencoe Mathematics: Quiz on the Ambiguous Case for the Law of Sines
The online assessment demonstrates knowledge of Algebra II. The questions test students on the ambiguous case for the law of sines.
McGraw Hill
Glencoe Mathematics: Online Study Tools: Self Check Quiz on Law of Cosines
The online assessment demonstrates knowledge of Algebra II. The questions test students on the law of cosines.
Mangahigh
Mangahigh: Shape: Use the Law of Sines for Finding Lengths
Deterime how to use the law of sines for finding lengths.
Mangahigh
Mangahigh: Shape: Use the Law of Sines for Finding Angles
Test your knowledge of using the law of sines to determine angle measures.