If the sum of the measures of two angles is 180 degree what are the angles?

The first angle is ( X ), a variable number where

the other angle is (180-X)

The sum of these two angles will always be 180* , X+180-X=180

In this case the variable number (X) is between negative infinity & positive infinity.

for eg. if the first angle is 1* the other angle would be 180-1, or 179*, & the sum of 1* and 179* is 180*