tolooong heheheheh,makasih yang mau bantu

dik.
<POQ = 60°
Pnjg busur PQ = 12cm
<ROS = 140°
dit. pnjng busur RS?
jwb.
60°/140° = 12/RS
RS x 60° = 140° x 12
RS = 140°/60° x 12
RS = 7/3 x 12
RS = 84:3
RS = ???