Question
The circles are not drawn to scale. The small circle is with radius r and the big circle is with radius R. The ratio of r to R is 5 : 8. If the area of the small circle is 81π m2, find R. Express your answer in mixed number.
2 m

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The circles are not drawn to scale. The small circle is with radius r and the big circle is with radius R. The ratio of r to R is 5 : 8. If the area of the small circle is 81π m2, find R. Express your answer in mixed number.