Math-Stache: The Dual 'Stache
A face covered in hair everywhere except where the mustache would be: the 'stache's complement, or dual.
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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/2017-07-12-math-staches--math-stache-the-dual-stache/ (CC BY-NC 4.0)Transcript
The Dual 'Stache