As everyone knows, a circle and PI form an inseparable unit. But where is its highest point?
This task is an April Fools’ joke. In mathematics a circle is a two-dimensional figure and has no height. But this riddle isn’t about mathematics at all. Circles also appear in geography. The German district of Pinneberg has the license plate code “PI,” and, at 61.3 meters above sea level, the highest point in this district is the Pinneberg summit on the island of Heligoland.
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This puzzle originally appeared in Spektrum der Wissenschaft and was reproduced with permission. It was translated from the original German version with the assistance of artificial intelligence and reviewed by our editors.