Use the relationship between supplementary angles ∠a and ∠b . What is m∠a if m∠b=121°?(1 point) Responses 31° 31 degrees 121° 121 degrees 59° 59 degrees 301°
The relationship between supplementary angles is that the sum of their measures is 180 degrees. So, if m∠b = 121°, then m∠a = 180° - m∠b = 180° - 121° = 59°. Therefore, the correct response is 59°.
