Answer:
The measure of the other angle is 59°
Step-by-step explanation:
Supplementary Angles
Two angles [tex]\alpha[/tex] and [tex]\beta[/tex] are supplementary when they add up to 180 degrees, i.e.
[tex]\alpha+\beta=180^o[/tex]
One notable property is that together they make a straight angle although they don't have to be together to be supplementary.
We are given one of two supplementary angles with a value of 121 degrees, we can compute the measure of the other angle, say [tex]\alpha[/tex] as
[tex]\alpha=180^o-\beta=180^o-121^o=59^o[/tex]
The measure of the other angle is 59°
