Respuesta :

JonHenderson55
C = 2* pi * r ;

is the formula for the circumference of the circle;
                      in which:
                                      C = the circumference of the circle;
                                      pi , or " π " ;  is the symbol for "pi" ; 
                                      r = the radius of the circle ; 
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To solve for "r" (the radius), divide each side by "2*pi" ;
         to isolate "r" (the radius) on one side of the equation;
        and to solve for "r" (the radius):
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C = 2*pi*r ;

C / (2*pi) = {2*pi*r} / (2*pi) ;

to get:
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C / (2*pi) = r ; 

↔ r = C / (2*pi)  .
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