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L = 1/4 π d2
626 = 1/4 x 22/7 x d2
626 = 22/28 d2
626 x 28 = 22d2
17582 = 22d2
17582/22 = d2
199,4 = d2
14,1 = d
jadi, diameternya = 14,1 cm,sdgkn jari2 (r) = 7,05 cm