Hello! So the first thing you want to do is fix the triangles so they are in the same rotation (you can tell which point goes where by matching the points of Trangle PQR to Triangle STU). Next, it’s a matter of addition and subtraction. You add the two known angle measures (46 and 70) and then subtract it from the total degrees a triangle has (180). You should then get 64 as your answer. Hope this helps :)