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 Lesson Plans (3) Interactives/Games (1) Learning Activities (1) Teacher Tools (1)

## Thinkfinity Lesson Plans

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Subject: Mathematics
Title: Law of Cosines
Description: In this Illuminations lesson, students use right triangle trigonometry and the Pythagorean theorem to develop the law of cosines. Included is a link to an online activity sheet.
Thinkfinity Partner: Illuminations

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Subject: Mathematics
Title: The Law of Sines
Description: This student reproducible, from an Illuminations lesson, guides students as they use right angle trigonometry to develop the law of sines.
Thinkfinity Partner: Illuminations

## Web Resources

### Lesson Plans

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Squares on a Triangle (Law of Cosines)
http://illuminations...
The law of cosines is an extension of the Pythagorean theorem, but seeing how –2ab cos C fits into the picture can be difficult for students. In this lesson, students who understand the Pythagorean theorem and right triangle trigonometry will discover the law of cosines by exploring the areas of squares on the sides of a triangle and their associated "defects."

### Interactives/Games

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Geometry Step-by-Step
http://agutie.homest...
This site provides a mix of sound, science, and Incan history in order to raise students' interest in Euclidean geometry. Visitors will find geometry problems, proofs, quizzes, puzzles, quotations, visual displays, "scientific speculation", and more.

### Learning Activities

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Geometry Step-by-Step
http://agutie.homest...
This site provides a mix of sound, science, and Incan history in order to raise students' interest in Euclidean geometry. Visitors will find geometry problems, proofs, quizzes, puzzles, quotations, visual displays, "scientific speculation", and more.

### Teacher Tools

Save to ALEX | | Show Details
Geometry Step-by-Step
http://agutie.homest...
This site provides a mix of sound, science, and Incan history in order to raise students' interest in Euclidean geometry. Visitors will find geometry problems, proofs, quizzes, puzzles, quotations, visual displays, "scientific speculation", and more.