Jawabanmu

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2014-05-27T20:53:00+07:00
K = 2 * pi * r
18,84 = 2* 3,14 *r
18,84 / 2 * 3,14 = r
3 = r
jari-jari lingkaran tsb yaitu 3 cm

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2014-05-27T20:55:05+07:00
18,84 = 3,14 x r x 2
18,84 x 100 = 628 x r
1884 = 628 r
r = 1884 : 628
r = 2