Need help with finding an angle

[Albob34]

I know we were taught this in class but im seriously stumped on how to do it and cant find my notes on it, help me out?

In Triangle RST, measure of angle RST = 46 and line RS is congruent to line ST. Find the measure of angle STR

 

[wjm11]

I know we were taught this in class but im seriously stumped on how to do it and cant find my notes on it, help me out?

In Triangle RST, measure of angle RST = 46 and line RS is congruent to line ST. Find the measure of angle STR

Just Google "isosceles triangle".