This pool shooting tutorial illustrates the 90 degree rule, which states that when the cue ball hits the object ball straight, the two balls will separate at 90 degrees. This is true regardless of the "cut angle," or angle the balls are apart from each other.
Use the 90 degree rule with cut angles in pool
Click through to watch this video on colostate.edu
External Content
www.engr.colostate.edu
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