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no one is given the credit of discovering maths
it came from Sir Alan Pi in 1898. he died 1 day after discovering it through being sniped by a Barrett .50cal
It is: pi*diameter
circumference of a circle = 2*pi*radius or pi*diameter
Formula for circumference: 2 x pi x r So, given radius is 11 Circumference of circle = 2 x pi x 11 = 22 pi m(most accurate answer) or 484/7,69 1/7 or 69.14286 m(if pi is given as 22/7) or 69.08m (if pi is given as 3.14)