Just a quick note on the more generic and far lest cited sibling of the Pythagorean theorem, the law of cosines. If you're like me, you were taught this formula sometime between the eighth and the eleventh grades and promptly forgot it after your exam. It's a formula that relates the length of one side of a triangle (any side), to its opposite angle and the lengths of the other two sides. The formula and its associated diagram, (courtesy of Wikipedia), are shown below:

**References:**

http://en.wikipedia.org/wiki/Law_of_cosines

**Picture of the Day:**

From 1/25/13 |

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