Plsssssss neeed help

The definition of a right triangle is a triangle with a right angle. Therefore one of the angles of the triangle is 90 degrees. The second angle is 61 degrees. The angles of a triangle sum to 180 degrees.
90 + 61 = 151
180 (sum of angle degrees in a triangle) – 151 (sum of 2 of angles of the triangle) = 29 (third angle measure)

Therefore the missing angle is 29 degrees
Hope this helps you! :)