Mathematicians Explain Sports: Basketball
Is three-point range a closed set? No: a sequence of three-pointers may converge to a two-pointer. Hence 'open threes'.
Use this cartoon
Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2017-06-28-mathematicians-explain-sports-to-each-other--mathematicians-explain-sports-basketball/ (CC BY-NC 4.0)Transcript
Basketball: "So is three-point range a closed set?" "No, a sequence of three-pointers may converge to a two-pointer." "Ah, that must be why they call them 'open threes.'" "Presumably."