Law of Cosines Teacher Resources

Find Law of Cosines lesson plans and worksheets
Showing 1 - 24 of 93 resources
3:56
Lesson Planet

Law of Cosines

For Students 11th - Higher Ed
Sal derives the Law of Cosines using a method similar to the wayward ship captain word problem he solves in another video. This video provides a good review of using the SOH-CAH-TOA model, the Pythagorean Theorem, some of the basic trig...
EngageNY

Law of Cosines

For Teachers 11th - 12th Standards
Build upon the Pythagorean Theorem with the Law of Cosines. The 10th part of a 16-part series introduces the Law of Cosines. Class members use the the geometric representation of the Pythagorean Theorem to develop a proof of the Law of...
Lesson Planet

Law of Cosines: Angles in the Outfield

For Students 10th - 12th
Take me out to the trig class. Individuals use an interactive to see how angles on a baseball field change as the position of two runners change. A set of challenge questions has them apply the Law of Cosines to solve problems.
Lesson Planet

The Law of Sines and the Law of Cosines

For Teachers Higher Ed
In this college level trigonometry worksheet, students apply the Law of Sines and the Law of Cosines to solve triangles. The four page worksheet contains forty-four problems. Solutions are not provided. 
EngageNY

Putting the Law of Cosines and the Law of Sines to Use

For Teachers 11th - 12th Standards
Use the Law of Cosines and the Law of Sines to solve problems using the sums of vectors. Pupils work on several different types of real-world problems that can be modeled using triangles with three known measurements. In the process,...
Lesson Planet

Law of Cosines: Baseball Diamond

For Students 10th - 12th
Catch a great resource! Individuals use an interactive that allows them to move players on a baseball field. They calculate distances between players using the Law of Cosines.
Lesson Planet

Law of Cosines: Get on Base

For Students 10th - 12th
Baseball is all about math. Young baseball and mathematics enthusiasts determine the distance between players on a baseball field using the Law of Cosines. An interactive helps them find relevant distances and angles to use in their...
Lesson Planet

Law of Cosines: Building a Zip Line

For Students 10th - 12th
Zip this resource into your lesson plans. Here is an interactive that shows how angles and lengths change based on conditions for a zip line. Scholars use the Law of Cosines to solve problems in this context.
Lesson Planet

A Different Proof of the Law of Cosines

For Students 9th - 12th
In this proofs worksheet, students construct 1 proof of the law of cosines.  Students construct a right triangle within a circle to  prove the law of cosines.
Lesson Planet

Identify Accurate Drawings of Triangles: Law of Cosines

For Students 10th - 12th Standards
Drawing triangles is easy, even if you have to calculate the exact length of its sides. Scholars use the Law of Cosines to find missing sides of triangles. An interactive helps them check their answers.
Lesson Planet

Law of Sines—Law of Sines and Law of Cosines

For Teachers 10th - 12th Standards
It's important to abide by the law. A thought-provoking instructional activity helps learners derive the Law of Sines. They then apply the Law of Sines to find unknown measures. 
Lesson Planet

Law of Cosines Word Problem

For Teachers 10th - 11th
Students solve problems using the law of cosines. For this precalculus lesson, students meet different criteria as they solve problems. They apply the formula for cosines to solve word problems.
2:51
Lesson Planet

Sine or Cosine Rule?

For Students 9th - 12th Standards
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...
Lesson Planet

Law of Sines and Law of Cosines

For Students 11th - 12th
In this Pre-calculus/Trigonometry worksheet, students use the laws of sines and cosines to solve triangles. The four page worksheet contains thirteen problems. Answers are not included.
Lesson Planet

Concepts in Precalculus 1: Trigonometry

For Teachers 11th - 12th
Young scholars investigate trigonometry.  For this Algebra II/Pre-calculus/Trigonometry lesson, students explore Islamic achievements in mathematics as they calculate angles and distances using the Law of Sines and the Law of Cosines. ...
Lesson Planet

Section 6.1-6.2 Precalculus: Trigonometry

For Students 9th - 12th
In this trigonometry worksheet, students solve 15 triangle problems.  Students use the law of sines and law of cosines to find the missing angles and side lengths of a triangles.
Lesson Planet

NUMB3RS Activity: To Pythagoras and Beyond

For Teachers 9th - 12th
Young scholars investigate the law of cosines. For this law of cosines lesson, students solve a problem based on a NUMB3RS episode. Young scholars find the missing lengths of non-right triangles. Students determine if a triangle is...
Lesson Planet

“The *Distance* Less Traveled

For Students 11th - 12th Standards
Use geometry to find your way from point A to point B! Learners work to build the Law of Cosines using a conceptual exercise. They use their knowledge of Law of Sines and a map triangulation activity to write their own equations for the...
Lesson Planet

Let's Go On Vacation!

For Students 9th - 12th Standards
You can cover some ground traveling from point A to point B to point C. Learners apply trigonometry to give values to the ground you cover. They choose three locations and create a map. Using the Law of Sines, Law of Cosines, and Heron's...
Lesson Planet

13-5 Skills Practice: Law of Cosines

For Students 10th - 12th
In this law of cosines learning exercise, students solve problems using the law of sines or the law of cosines. They determine the value of a leg of a triangle and it's measurement. This one-page learning exercise contains 16 problems.
Lesson Planet

Law of Sines and Law of Cosines

For Students 9th - 11th
In this sine and cosine worksheet, students use the law of sines and law of cosines to find the required part of a triangle. Examples and explanations are provided. This three-page worksheet contains 24 problems. Answers are listed at...
Lesson Planet

Some More Trigonometry

For Teachers 9th - 10th
Students define the law of cosine and its correct usage. In this trigonometry lesson, students define the law of Heron's area formula and use it to solve problems. They review other trigonometric values and identify the identities.
Lesson Planet

Journey of the Nez Perce

For Teachers 10th - 12th
Learners study the retreat of the Nez Perce Native Americans into Montana while tracing their journey on a map. They use the law of cosines to solve problems based on the navigational methods of the Nez Perce. They work with both the law...
Lesson Planet

Law of Cosines

For Students 9th - 11th
In this law of cosines worksheet, students use the law of cosines to solve information on given triangles This one-page worksheet contains four problems.

Browse by Subject


Law of Cosines