FuseSchool
Sine Rule
Discover how to apply the Law of Sines to find unknown side and angle measures. A detailed video lesson describes the Law of Sines in different forms. The instructor completes two different examples that find both an angle and side...
FuseSchool
Sine or Cosine Rule?
Explore triangle problems that require the Law of Sine or Law of Cosine. A straightforward lesson focuses on deciding when to use each law. The instructor presents several triangles for pupils to consider and describes patterns in the...
Mathematics Assessment Project
Modeling Motion: Rolling Cups
Connect the size of a rolling cup to the size of circle it makes. Pupils view videos of cups of different sizes rolling in a circle. Using the videos and additional data, they attempt to determine a relationship between cup...
Khan Academy
Khan Academy: Trigonometry: Law of Cosines
This is a video showing how to derive the law of cosines. [9:27]
Khan Academy
Khan Academy: Trigonometry: 2003 Aime Ii Problem 11
Video demonstrates solving a trigonometric problem that includes finding the area of an oblique triangle using the Pythagorean Theorem and the law of cosines [16:35]
Khan Academy
Khan Academy: Trigonometry: Proof: Law of Sines
Video deriving the law of sines. Includes discussion of why it is useful. [6:33]
Math TV
Math tv.com: Triangles: An Ambiguous Case
The video tutorial investigates the law of sines and the ambiguous case. A worksheet consisting of practice problems and solutions is included to check for understanding of the concept. In the left hand menu, click on Trigonometry,...
Math TV
Math tv.com: Triangles: The Law of Cosines
The video tutorial investigates how to use the law of cosines to solve for different parts of a triangle. A worksheet consisting of practice problems and solutions is included to check for understanding of the concept. In the left hand...
Math TV
Math tv.com: Trigonometry: Solving Right Triangles
Students learn how to use the six trigonometric definitions to solve right triangles. The learning resource consists of a video tutorial and a worksheet with practice problems. In the left hand menu, click Trigonometry, Solving Right...
Khan Academy
Khan Academy: Basic Trigonometric Ratios: Using Trig Functions Part Ii
A couple of more examples of using Trig functions to solve the sides of a triangle. This video use the basic trigonometric functions to determine unknown side lengths of a right triangle. Example shows using trigonometry as well as the...
Virtual Nerd
Virtual Nerd: What Is the Law of Sines?
The Law of Sines helps with finding a missing side or angle measurement of a triangle. Watch this tutorial to learn about this proportion. [5:57]
Khan Academy
Khan Academy: Trig Identities: Law of Cosines
Introduction to the law of cosines to solve for a side of a triangle when 2 sides and an angle are known.
Khan Academy
Khan Academy: Trig to Solve the Sides and Angles of a Right Triangle
Worked example using trigonometry to solve for the lengths of the sides of a right triangle given one of the non-right angles.
Virtual Nerd
Virtual Nerd: What Is the Law of Cosines?
The Law of Cosines helps solve some triangle problems. This video explains several versions of the law of cosines and what they are used for. [9:22]
PatrickJMT
Patrick Jmt: Law of Cosines, Example 1
Easy to follow video tutorial gives the formula for the Law of Cosines and uses it to find the missing side length of a triangle. [5:05]
Khan Academy
Khan Academy: Basic Trigonometric Ratios: Basic Trigonometry Ii
A few more examples using SOH CAH TOA. Examples of finding sine, cosine and tangent for two different right triangles, including finding side lengths by the Pythagorean Theorem and rationalizing the denominator.
Khan Academy
Khan Academy: More Trig Examples: 2003 Aime Ii Problem 11
Video demonstrates solving a trigonometric problem that includes finding the area of an oblique triangle using the Pythagorean Theorem and the law of cosines.
PatrickJMT
Patrick Jmt: The Law of Sines, Example 1
Easy to understand video gives the formula and provides an example pertaining to the Law of Sines. [3:54]
PatrickJMT
Patrick Jmt: The Law of Cosines
This video provides the formula for the 'Law of Cosines' and one 'applied' example is shown. [4:58]
Khan Academy
Khan Academy: Trig Word Problem: Stars
Sal solves a word problem about the distance between stars using the law of cosines.
Khan Academy
Khan Academy: Solving for an Angle With the Law of Sines
Sal is given a triangle with two side lengths and one angle measure, and he finds all the missing angle measures using the law of sines.
Khan Academy
Khan Academy: Solving for a Side With the Law of Sines
Sal is given a triangle with two angle measures and one side length, and he finds all the missing side lengths and angle measures using the law of sines.
Khan Academy
Khan Academy: Solving for a Side With the Law of Cosines
Learn how to use the law of cosines to find the missing side length of a triangle when given two side lengths and the contained angle measure.