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Area = πxR²
Area1 = πx(a)²
Area1 = πa²
Ahora Radio = 2a
Area2 = πx(2a)²
Area2 = πx4a²
Para ver en cuanto aumenta dividimos Area2/Area1
=[(πx4a²)/(πa²)] Cancelo π cancelo a² y me queda 4
[(πx4a²)/(πa²)] = 4
Entonces al aumentar al doble el radio el area se cuadruplica