Law of Cosines Teacher Resources
Find Law of Cosines educational ideas and activities
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In this Law of Cosines worksheet, 10th graders solve 10 different problems related to applying the Laws of Cosine. First, they determine the length of a side rounded to the nearest integer. Then, students determine the largest angle of a triangle described to the nearest degree. In addition, they determine the length of a larger diagonal of a rhombus.
In this law of cosines worksheet, 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 geometry activity, 10th graders use the Law of Sines or the law of Cosines to find the missing angle measures of a triangle. The one page interactive activity contains five multiple choice questions. Answers are included.
Students solve problems using the law of cosines. In this precalculus instructional activity, students meet different criteria as they solve problems. They apply the formula for cosines to solve word problems.
In this law of cosines worksheet, 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 worksheet contains 16 problems.
In this Law of Cosines worksheet, 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 cosine worksheet, high schoolers 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.
In this activity, geometers are asked to solve a real-world problem involving a construction project on a college campus. Students work in groups to come up with a proposal for the construction. In doing so, they must consider dimensions of some existing structures and propose a solution that meets certain requirements. The solution requires using the Law of Sines and the Law of Cosines, as well as application of critical thinking skills.
In this law of sines and cosines worksheet, students solve 8 problems finding missing sides and missing angle measures of various triangles.
In this pre-calculus worksheet, 11th graders recall the three forms of the law of cosines and used it to solve problems involving triangles. They also write out the laws of sines and use those to solve problems with angles. There are 15 questions.
In this geometry worksheet, 10th graders solve problems involving triangular inequality. They apply the proofs and theorem of triangles to solve these problems. There is an overview and one question.
In this sine and cosine worksheet, students complete problems about triangles with sine and cosine. Students complete 10 problems total.
Students study the law of sine and cosine. In this pre-calculus lesson, students create a triangle and identify the different ratios of a non-right triangle. They use the properties of sine and cosine to solve.
Learners calculate the different sides and angles of triangles. In this geometry instructional activity, students use the properties of triangles to identify congruent and similar triangles. They use trig to find angles of triangles.
Students solve problems using sine and cosine. In this precalculus instructional activity, students apply the properties of sine and cosine to solve non-right triangle problems. They use Heron's Law to find the area of a shape.
Students explore the concept of law of sines and cosines. In this law of sines and cosines instructional activity, students use the law of sines and cosines to solve triangles that are right triangles and non-right triangles.
Students investigate the different properties of trigonometry. In this precalculus lesson, students find the six different identities of trigonometric ratios. They relate the ratios to that of a right triangle and apply it to real life scenarios.
In this pod racing worksheet, students simulate pod racing. They identify angles and distance from points. Students use the law of cosines to find distance. This three-page worksheet contains 4 multi-step problems.
In this law of cosines activity, students solve five multiple choice problems. Problems vary from straight computation to story problems. Each time the activity is accessed, a different set of problems is selected from the bank of questions. The activity is self-scoring.
Students solve problems using the Law of sines and cosines. In this trigonometry instructional activity, students identify the sides of triangles that are not right triangles and they identify the angles without using the Pythagorean theorem.