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80:2 = radio 40
datos
perimetro (P) =251,2cm
π = 3,1416
formula
p = 2πr
r = p/2π
r= 251,2/(2. 3,1416)
r = 251,2/6,2832
r = 39,9 aproximando = 40
El radia mide 40cm
el diametro = 2 .40 = 80cm
saludos