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Circumference = 2πr
Diameter = 2r
A.t.q,
2πr = 2r + 30
2r( π - 1) = 30
r(π - 1) = 15
r ( 22/7 - 1) = 15
r ( 22 - 7/7) = 15
r ( 5/17) = 15
r = 17 × 15/5
r = 17 × 3
r = 51 cm
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