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is pi is a single number ?

(A1 : A2 ) > ( O1 : O2 )A - diameter of a circleO- circumference of a circle.

Can you prove that ( A1 : A2 ) = ( O1 : O2 ) with out assume that pi is a single number ?

http://mymathforum.com/geometry/50519-single-pi-number.html