You have a rope that will reach around the earth (+/- 40,000 km). If you put sticks of 1 meter high around the world and lay the rope on these sticks, how much longer will the rope need to be?

Answer: ONLY 6.28 meter (= 2 PI) And the strange thing is that it even doesn’t matter how great the original circle is: it can be 1m, 100m or 1000 km in radius, if you extend the radius by 1 meter, the rope always gets 6.28 meters longer.

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