Answer:
20 Degree
Step-by-step explanation:
First, we should note that the inside of a triangle's angles always adds up to 180 degrees.
First, we should find the angle of the other corner with the 58.5. Since it's a flat line it should add up to 180 degrees.
We can do 180 - 58.5 = 121.5
That gives us the angle of the bottom right corner.
Then we add that answer of 121.5 + 38.5 to get 160.
Finally, since as noted at the start there has to be 180 degrees in a triangle we can now subtract 160 from 180 (180-160) to get the last angle and our answer of 20.
