Concept explainers
Möbius map (H). Using felt-tip color pens that soak through both sides of the paper, draw a map on the Möbius band that has five countries, each of which touches the other four; that is, each and every country shares a border with the four other countries. Similarly, draw a map on the Möbius band that has six countries, each of which shares a border with the five other countries.
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