Question

Find tbe supplementary angle to an angle that is 128 degrees. Explain your answer.​

Answer 1

Answer:  51.1 degrees

Explanation:

If some angle x is supplementary to $128.9^{\circ}$, then we can say the following:

$x+128.9 = 180\\\\x = 180-128.9\\\\x = 51.1$

Therefore, the two angles $51.1^{\circ}$ and $128.9^{\circ}$ add to 180 degrees. The two angles can be glued together to form a straight line.