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L = 2πr ( r+t )
4396 = 2 x 3.14 x r ( r + 15 )
4396 = 6.28 x r ( 15r )
4396 = 6.28 x 15r²
15r² = 4396 ÷ 6.28
r² = 700 ÷ 15
r = √46.66
r = 6.831