Jawabanmu

2014-05-16T15:26:54+07:00
108/360 = 3/10
3/10 x 3,14 x r^2 = 211,95
3,14 x 3 x r^2 = 211,95 x 10
r^2 = 2119,5/9,42
r^2 = 225 -> r=15 cm

maaf kaIo saIah..
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