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2Rb = Rb
la formula del área es A = r²π
Aa = (2Rb)²π Ab =Rb²π
Aa = 4Rb²π Ab =Rb²π
x = Rb²π/4Rb²π
x= 1/4 = 25 %
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