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A regular octahedron is made up of eight equilateral triangles, each with side length one unit, as shown below. If an ant starts at the top vertex and walks along the edges of the triangles without ever traversing the same edge twice, how many units are in the maximum distance she could walk before first returning to the starting vertex?

 Aug 1, 2020
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The maximum distance is 11.

 Aug 1, 2020

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