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t = 8 cm
dit : L. selimut = ??
jawab :
K = 2 . π . r
r = 30 / (2 . π)
r = 15 / 3,14
r = 4,7 cm
L.selimut = 2 . 3,14 . 4,7 . 8
= 236,128 cm²