Jawabanmu

2014-02-19T20:55:41+07:00
18,84 = sudut/360 X 2 X 3,14 X 15
6782,4 sudut X 30 X 3,14
sudut = 72
2014-02-20T05:28:11+07:00
K=2 \pi r
K=2x3,14x15
K=94,2
 \frac{Keliling}{Panjang Busur} = \frac{360}{Besar Sudut AOB}
 \frac{94,2}{18,84} =  \frac{360}{Sudut AOB}
94,2xSudut AOB = 18,84x360 (kali silang)
94,2AOB = 6782,4
AOB=6782,4 : 94,2
AOB= 72^{o}