Do you know, if we had two points in degrees on a circle and we wanted to derive an unknown 3rd point in degrees could we do it if we knew that the third point had a known angle to the other two points?

So the three points together make a triangle, as an example ;

Point (1) is on the circle at 30 degrees

Point (2) is on the circle at 90 degrees

Point (3) exists somewhere on the circle and we know that it has a 75 degree internal angle to Point (1) and (2), how can we determine at what degree on the circle point (3) is situated at?