Answer:
Why are the two triangles similar?
The boxes you should check are:
A. & D.
What did you use to determine this?
The boxes you should check are:
B. & D.
Notes:
Complementary angles are TWO angles that equal up to 90 degrees. (have to be side by side)
Corresponding angles are the angles which occupy the same relative position at each intersection where a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal. This means that it could help us find the measures of the triangles just by going across.
Interior is inside and exterior is outside.