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el radio del circulo B es R = 2r
area del circulo A = π.r²
area del circulo B = π(2r)² = π(4r²) = 4πr²
Regla de tres:
Porecentaje Area
----------------- ----------
x% πr²
100% 4πr²
x(4πr²) = 100(πr²) ---->simplificando πr² y 4ta
x = 25 entonces representa el 25% Rtaaaa