Pre-Calculus Law of Cosines (SSS) and TI Programming

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David from Seattle Academy records some of his lessons for his students to review . This lesson helps students use the law of cosines to find the opposite angle given side-side-side. I then demonstrate how to right a program on a TI calculator to solve all SSS questions.
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Might be the mode you are in on the calculator. Mode button near the top, then make sure degree is set.

electricteaching
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Doesn't seem to work with the TI-84 Plus. i get .63418....

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