Answer:
66°
Explanation:
In a triangle, if one side is extended, an exterior angle is formed at the vertex where the side is extended
This exterior angle is the sum of the interior angles
Here the angle with measure 104° is the exterior angle
The interior angles are x and the one with meaure 38
So x + 38 = 104
⇒ x = 104 - 38 = 66°