Jawabanmu

2014-06-05T21:33:53+07:00
AB = </360*π*d
 18 = 60/360*22/7*d
 18 = 1/6*22/7*d
 18 = 22d/42
 756= 22d
d = 756/22 = 34,4
r = 1/2*d = 1/2*34,4 = 17,2