Law of Cosines - Practical Applications

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#1)  Law of Cosines - Practical Applications

Postby Matt Markworth » Sun Jan 24, 2016 10:49 am


As a spin-off of the "Trigonometry Game" thread, I have started this new thread to discuss practical applications of the Law of Cosines. My first thought is that it is nice to have a formula that doesn't require a right triangle.

dbhguru wrote:
Here is a problem that calls for solving for the angles of a triangle when the lengths of the sides are known. As a hint, think law of cosines.

Trig Problme %232.png
Trig Problme %232.png (28.59 KiB) Viewed 294 times

  There are practical applications that call for determining an angle of a plane triangle when the sides are known. Let's first see the solution.

Law of Cosines formulas:

law of cosines (2).jpg

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