Question

Find the supplementary angle to an angle that is 128.9 degrees. Explain your answer.

Answer 1

Well, supplementary angles are defined as angles that add up to *180 degrees* soo:

\[\large 180-128.9 = ? \]

It will be whatever the difference between the two is

Answer 2

To find the supplementary angle to an angle that is 128.9 degrees, we need to subtract 128.9 from 180, which is the measure of a straight angle.

180 - 128.9 = 51.1

Therefore, the supplementary angle to an angle that is 128.9 degrees is 51.1 degrees.