Law of Cosines Teacher Resources

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Young scholars explore the law of cosines.  In this geometry/trigonometry lesson, students investigate the relationship between the Pythagorean Theorem and the law of cosines.  The lesson is designed to guide young scholars in deriving the laws of Cosines as it relates to any type of triangle.    
In this pre-calculus learning exercise, 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 trigonometry worksheet, high schoolers 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.
In this geometry instructional activity, 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. For 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.
Students 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 lesson, 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 investigate the different properties of trigonometry. In this precalculus lesson plan, 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 learning exercise, students simulate pod racing.  They identify angles and distance from points.  Students use the law of cosines to find distance.  This three-page learning exercise contains 4 multi-step problems.
Learners investigate the law of sines and cosines.  For this law of sines and cosines lesson, students construct a 3d sketch of a card table.  Learners discuss the law of sines and cosines with the teacher.  Students use the law of sines and cosines to help in constructing their card table.  Learners research the cost of materials and determine the cost of their card table.
In this proofs instructional activity, high schoolers construct 1 proof of the law of cosines.  Students construct a right triangle within a circle to  prove the law of cosines.
In this law of cosines worksheet, students solve five multiple choice problems. Problems vary from straight computation to story problems. Each time the worksheet is accessed, a different set of problems is selected from the bank of questions. The worksheet is self-scoring.
Pupils solve problems using the Law of sines and cosines. In this trigonometry lesson, students identify the sides of triangles that are not right triangles and they identify the angles without using the Pythagorean theorem.
In this trigonometry learning exercise, students apply the Law of Sines and Cosines to solving for missing sides of a triangle. There are 5 questions with an answer key.
In this trig worksheet, 12th graders, students rewrite angles using the law of sine and cosine. They find each missing angle of a triangle. There are 8 questions on this chart.
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.
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.
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.
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.

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Law of Cosines