Answer:
360°
Explanation:
So you can find out the other angles in the triangle.
They are 51°, 68°, 61°
The exterior angles are 129°, 112°, 119°
129 + 112 + 119 = 360°
You could also just say that the sum of all of the exterior angles of a triangle is 360°
It's also true for any other convex polygon ;)