Assertion: rolling cue ball | /r/HasProperty | topspin
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text: As Dr. Dave Alciatore teaches at his marvelous pool instructional website, understand that the cue takes off at about a 30-degree angle on cut shots (make a V-sign with two fingers to see what 30 degrees off line is) for rolling cue balls (topspin) versus stunned tangent lines of 90 degrees.