Many students have trouble remembering the special triangle trigonometric functions as used in Quadrant I of the Unit Circle. The two methods here are mnemonic triggers to assist you to learn these important values. Which one you use is entirely up to you.
The one with the hand is convenient since you need not write anything down to remember the basic sine and cosine functions. The left one is more convenient when you need to find the tangent. Of coures, do not forget your reciprocal functions.

This applet can be used by teachers in a demonstration mode in the classroom or teachers can have students load it on their own computers with a worksheet to be complete for a grade.