To find the answer for this question you need to first understand that 3 angles of a triangle make up 180 degrees. To make a triangle you want to cut the shape down from the 82 degrees to the degrees X. You then will be left with angle Y, a 90 degree angle, and the angle cut in half (which would be 41). You add 41 to 90 to get 131, and subtract that from 180 to get 49 degrees as your angle Y. Hope this helped <3