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How to figure out Sin and Cos of common angles in one minute

Updated on March 6, 2010

This is a very quick hub for a very quick method of memorizing easy ways to finding the sin and cos of common angles (0, 30, 45, 60, and 90 degree angles).

Using MS Paint I made the following diagrams. I'm sure that you'll notice the pattern. Unfortunately I have already taken every math class that I'll ever have to take, so I have no use of this.. and I wish that I had this freshman year geometry. 

There are two numbers, "square-root" of 2 and "square-root" of 3 are 1.4 and 1.7 respectively. You can remember these by remembering the dates for Valentine's day and St. Patrick's day (February 14th 2/14 and March 17th 3/17 respectively). 

Let me know what you think! :)


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      James 4 years ago

      Nice thanks :)