Answer:
∠RST = 110°
Step-by-step explanation:
A quarter circle has 9 of the alternately-colored sections in it, so we believe each to be 90°/9 = 10° in central angle. The angle RST adds two more sections, so it is 11 sections in all. Then that angle is ...
∠RST = 11 · 10° = 110°
