This video illustrates how to use your own hand to help visualize the 90 degree rule when shooting pool and determine where the cue ball and the object ball will go, so you don't scratch. The thumb and forefinger spread out in an "L" shape will effectively predict the directions the cue ball and the object ball will take.


Visualize the 90 degree rule in pool
Click through to watch this video on colostate.edu
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