Answer: The angles are neither complementary nor supplementary.
Step-by-step explanation:
If the sum of two angles is 180 degrees then we call them as supplementary angles.
If the sum of two angles is 90 degrees then we call them as complementary angles.
The given angles : m∠ABC=138° and m∠DEF=31°
Sum of angles =m∠ABC+ m∠DEF=
which is nor equals to neither .
Hence, The angles are neither complementary nor supplementary.