Definition:Dunce Hat

Definition

The dunce hat is the surface obtained by taking an equilateral triangle $ABC$ and identifying the sides $AB$, $AC$ and $BC$ all together.

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Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): dunce hat
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): dunce hat