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 Squares On A Triangle This lesson will help students understand the law of cosines and the Pythagorean theorem. The material has students find out whether a triangle is acute, obtuse, or right; determine a formula for the law of cosines to relate the sides of any type of triangle, and explain how the Law of Cosines is an extension of the Pythagorean theorem. Student activity sheets are included. This material is... http://illuminations.nctm.org/Lesson.aspx?id=2517
 Statics - Trig: Pythagorean Theorem Calculations Using a TI-86 In this animated and interactive object, the learner uses a TI-86 calculator to solve for the magnitude of the resultant and of one of the component forces in a right triangle. Target Audience: 2-4 Year College Students https://www.wisc-online.com/learn/technical/engineering/eng9...
 Centre for Innovation in Mathematics Teaching: Interactive Tutorials (Book 8) Based at the University of Plymouth, the Centre for Innovation in Mathematics Teaching has developed many instructional materials designed to help both novice and experienced math teachers. This particular area of their website provides access to a number of interactive mathematics tutorials. The materials are divided into eight units, including those that deal with factors, mathematical diagrams... http://www.cimt.plymouth.ac.uk/projects/mepres/book8/book8in...
 Seeing and Learning Astronomy and Cosmology Through the Lens of Music Exploring music, astronomy and cosmology, starting with the historical roots; the Pythagoreans in particular contributed profoundly to the development of Western Music by discovering two facts: first, that the sound caused by the string depends on the length of the string; second, that harmonious sounds are given off by strings whose lengths are related to each other as ratios of whole numbers.... http://www.yale.edu/ynhti/curriculum/guides/1996/6/96.06.13....
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