Lesson Plans and Worksheets
- Home /
- Teacher Resources /
- Math /
- Trigonometry /
- Trigonometric Identities /
- Law of cosines
Browse by Subject
- Law of cosines
-
Related Topics
Featured Testimonial
Lesson Planet has been easy to use and access always. The lessons have been invaluable to me.
Thanks to all who have developed such inspirational lessons.
- Erin R., Teacher
- 06-19-11
Law of cosines Teacher Resources
Find teacher approved Law of Cosines educational resource ideas and activities
Title
Resource Type
Views
Grade
Rating
For 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.
In this law of cosines learning exercise, students determine angle measures, area, and number of solutions in five multiple choice problems by applying the law of cosines. The solutions are provided by clicking on the "Check It" button found on the bottom of the page.
In this Law of Cosines instructional activity, students are asked to demonstrate the ability to apply the Trigonometric Law of Cosines and the Inverse Law of Cosines to solve for sides and angles of right triangles.
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 the bottom of page three.
Students apply the law of sines to solve problems. In this trigonometry lesson, students apply the correct formula to solve a non-right triangle. They apply these concepts to navigational vectors and find the direction and magnitude.
Students calculate the unknown sides and angles of a triangle and explore why one cannot determine the lengths of the sides of triangles if only the angles are known. Students explore the Law of Sines and the Law of Cosines by creating and measuring triangles. Students calculate the unknown sides by applying the correct formula.
Students explore the concept of triangles. In this triangle lesson, students determine whether a triangle is acute, right, or obtuse using the Pythagorean theorem. Students derive the law of cosines from the Pythagorean theorem.
In this cosine worksheet, students will find the length of the third side of a triangle given the length of the other two side. Students will use the Law of Cosines to find the length of the missing side. Answers will be rounded to 3 decimal places for the length and 1 decimal place for angle measures.
Students explore the concept of drafting. In this drafting lesson, students complete a project involving land surveying. Students refer to survey maps as they use the law of cosines and AutoCAD to construct drawings of the land survey. Students present their results to an "engineering firm" (the teacher) and to their class.
In this law of sines worksheet, students read story problems. They use both algebra and the law of sines and cosines to solve problems. This two page worksheet contains seven problems.