Pi Formula: Machin's Machine
Machin's formula as a machine that turns 1/5 and 1/239 into pie.
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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/2016-03-14-pi-formula-machin-s-machine/ (CC BY-NC 4.0)Transcript
"Machin's Machine" [1/5 and 1/239 ride a conveyor into a box; a pie comes out] π = 16 arctan(1/5) − 4 arctan(1/239)