Anna is correct. The remaining angle of the triangle measures less than 90 degrees.
Acute angles:
- Acute angles are those angles that measure less than 90 degrees.
- Since Triangle DEF contains 2 congruent acute angles.
- So, This means each of those 2 acute angles in the triangle are less than 90 degrees.
Learn more about the triangle here; https://brainly.com/question/25813512?referrer=searchResults