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Widen your circle of friends
By mansuetus (Translasted by Minizyl) - Aug. 28, 2010   


Whether a circle is composed of 10, 100 or 1000 people, everyone has to step back 11 inches (28 cm) in order to fit one new person in the circle.

Details:

Instinctively, you might think that adding one person to a circle composed of thousands will cause each of them to step back less than an inch so that the new comer fits in the circle.

Counterintuitively, it's not the case, because the perimeter and the radius of a circle are proportional :

P = 2 * π * R

Thus, if you increase the perimeter by 5 ft 10 in (which roughly is the stature of a man), you have to increase the radius by (5 ft 10 in)/(2 * π) to keep the circle consistent.


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