CK-12 Foundation
Ck 12: Trigonometry: Law of Sines
[Free Registration/Login may be required to access all resource tools.] This lesson introduces the Law of Sines for two cases.
Calculator Soup
Calculator Soup: Law of Sines Calculator
Use the law of sines to calculate unknown angles or sides of a triangle. In order to calculate the unknown values, you must enter 3 known values.
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.)
Other
Radford University: Law of Sines
This page states the Law of Sines and provides some interactive graphics that may help you understand the law more clearly.
Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Law of Sines and Law of Cosines
Sixteen problems present practice working with the Law of Sines and Law of Cosines. 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"...
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.
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.
Math Planet
Math Planet: Algebra 2: Sines
Defines and examines the law of sines through examples and a video lesson. [2:02]
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.
CK-12 Foundation
Ck 12: Trigonometry: Law of Cosines
[Free Registration/Login may be required to access all resource tools.] Use Law of Cosines and Law of Sines in different triangle situations.
Windstream
Ojk's Precalculus Study Page: The Law of Sines
An introduction to solving acute and obtuse triangles by using the law of sines, including a derivation of the formula. Includes several pictures and examples.
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...
Analyze Math
Analyze Math: Sine Law Ambiguous Case Applet
Learn how the ambiguous case of the law of sines arises from the ASS situation and how to solve problems of this type. Definitely use the applet to visualize the two distinct outcomes that are possible and to understand the circumstances...
Math Is Fun
Math Is Fun: Triangle Identities
View examples of triangle identities, equations that are true for all triangles: Law of Sines, Law of Cosines, and Law of Tangents. Follow links to learn more about the purpose and examples of each identity.
Oswego City School District
Regents Exam Prep Center: Working on a Rescue Team Lab
Your students are part of the Yellowstone National Park rescue team which has just been dispatched to help located a downed plane. How can they effectively use the Law of Sines and the Law of Cosines to assist them in finding the plane?...
Government of Alberta
Learn Alberta: Math Interactives: Exploring Trig Ratios
Investigate the cosine, sine, and tangent ratios of trigonometry using this interactive Learn Alberta math resource. Students will use these ratios to determine a right triangle's unknown side or angle. Be sure to follow the link to the...
Khan Academy
Khan Academy: General Triangle Word Problems
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.
Other
Karl's Calculus Tutor: Trigonometric Functions
Great application of trig and introduction to the trig functions. Also found here are the Law of Sines and Law of Cosines as well as other trig topics to review.
Analyze Math
Analyze Math: Triangle Problems
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.
CK-12 Foundation
Ck 12: Trigonometry: General Solutions of Triangles
[Free Registration/Login may be required to access all resource tools.] A summary of when to use the law of cosines or the law of sines to solve triangles.
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.
CK-12 Foundation
Ck 12: Determination of Unknown Triangle Measures Given Area
[Free Registration/Login may be required to access all resource tools.] Looks at triangle problems where you are given the area and must use trigonometry to find unknown sides or angles.
ClassFlow
Class Flow: The Law of Cosines
[Free Registration/Login Required] This flipchart defines and uses the law of cosines to find the missing sides and angles of oblique triangles.
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