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Law of Cosines Teacher Resources
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Sal starts to solve a trigonometric word problem of a wayward ship captain who veers off course and once aware of his predicament, needs to know how far he is from his destination. Instead of using the Law of Cosines in his solution, Sal uses the SOH-CAH-TOA model, the Pythagorean Theorem, and basic trigonometric identities along with a review of algebraic manipulation of trigonometric functions. He runs out of time to complete this problem in this video; it is completed in part 2.
Students 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 students in deriving the laws of Cosines as it relates to any type of triangle.
Students investigate the law of sines and cosines. In this law of sines and cosines lesson, students construct a 3d sketch of a card table. Students 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. Students research the cost of materials and determine the cost of their card table.
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.