what does the triangle symbol mean in geometry
Triangle A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted   △ A B C  {\displaystyle \triangle ABC} .
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
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Dodecagon In geometry, a dodecagon or 12-gon is any twelve-sided polygon.