Answer:
40 degrees.
Step-by-step explanation:
When you inscribe a triangle into a semicicle, you always end up with a Triangle rectangle, which has a 90º angle and two angles of different or same degrees.
In this specific problem, the other angle of the triangle is 50º, if you remember the laws of the traingles the sum of all the interior angles of any triangle is 180, so you just have to substract the sum of the other two angles:
180º-90º-50º= 40º
The other angle in the inscribed triangle would be 40º
