Ratio of diameters of two circles is 4:5, the ratio of their circumference is
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Now we know that the radius is equal to half of the diameter. If the diameters are in the ratio 1:5 the radius of the circles are in the ratio 1:5. The circumference of a circle is given by 2*pi*r. Multiply R1 and R2 by 2*pi, we get 2*pi*R1 : 2*pi*R2 = 1:5.
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