Jawabanmu

2014-06-07T05:11:04+07:00
Sudut QOR = 360 - 72 = 288 derajat

p busur QR =  \frac{35}{72} ×  \frac{x}{288}
x =  \frac{35}{72} × 288
x = 140
jadi panjang busur QR = 140 derajat
2014-06-07T13:32:22+07:00
< QOR = 360 - 72 = 288°
panjang busur QR = 35/72 X x / 288
x = 35 / 72 x 288
x =140°