Maths and Stats by Email | Different types of distance: "How does a fish measure distance?
How far away is the other side of a hill? If you’re looking at a map, it might be a few kilometres. If you’re a fish, the straight line distance doesn’t mean very much. What matters is the distance along creeks and rivers. Two streams on opposite sides of a ridge might not connect for hundreds of kilometres, or in some cases, they never meet at all!
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