Use the relationship between supplementary angles ∠a and ∠b . What is m∠a if m∠b=121° ?(1 point) Responses 59° 59 degrees 31° 31 degrees 121° 121 degrees 301°
If ∠a and ∠b are supplementary angles, it means that the sum of their measures is 180 degrees.
In this case, if m∠b is given as 121°, we can find m∠a by subtracting 121° from 180°.
m∠a = 180° - 121° = 59°
Therefore, m∠a is 59°.