find the radius of the bigger circle if the area of the ring is 96π cm² and the area of the smaller circle is 34π cm².
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answer is √130
let area of bigger circle be πr²
→πr²-34πcm² = 96πcm²
→ r = √130
let area of bigger circle be πr²
→πr²-34πcm² = 96πcm²
→ r = √130
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