Question

Ray SU is an angle bisector of ∠RST. The measure of ∠TSU is 42°. What is the measure of ∠RST?

Answer 1

If we were to focus only on <RSU, the measure would be the same as <TSU, which is 42 degrees. However, because it is asking for the entire angle (<RST), the measure would be doubled. The measure of <RST is 84.