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The following videos show some math tricks to help you remember the values of a unit circle and Trig Ratio of Special Angles in degrees (0, 30, 45, 60, 90) and also in radians.

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on Trigonometry

A Trick to Remember Values on The Unit Circle

People often forget what x,y coordinates on the unit circle go with what angle. This video shows a little 'trick' to remember the values on the unit circle in the first quadrant.

A Way to remember the Entire Unit Circle for Trigonometry.

The Unit Circle Values from Zero to a quarter of Pi or an eigth of the Pie.

Resist the temptation to learn the unit circle as a whole. Learn it the first one eight of the way around and practice using a reflection, and then another reflection and then another reflection.

How to remember the values on a unit circle

Explanation of an easy trick for memorizing the values of the unit circle.

Unit Circle Hand Trick

A Finger Trick for Trigonometry

If we insist that students memorise the values of sine and cosine for the basic angles 0, 30, 45, 60 and 90 degrees, then here's a cute little trick for doing so using the fingers on your hand.