In which groupthe given angels(160,20)will fall, if their sum is 180

Supplementary angles.

Step-by-step explanation:

We can define two big groups of pairs of angles.

Complementary and supplementary angles.

Two angles are complementary if the sum of their measures is equal to 90°

Two angles are supplementary if the sum of their measures is equal to 180°

Here, we have the angles 160° and 20°, and we know that their sum is 180°

Then we can conclude that the given angles fall in the group of the supplementary angles.