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Area of circle = π r² Let the radius of first circle is r units and the radius of second circle be R units area of first circle = πr² area of second circle = πR² A/q (πr²)/(πR²) = 16/81 ⇒r²/R² = 16/81 ⇒r/R = 4/9______(1) now, circumference of first circle = 2πr circumference of second circle = 2πR ratio, (2πr)/(2πR) =r/R = 4/9_______(from equation 1)