Use the relationship between supplementary angles ∠a and ∠b . What is m∠a if m∠b=121° ?(1 point)
Responses
121°
121 degrees
301°
301 degrees
31°
31 degrees
59°
1 answer
Supplementary angles add up to 180 degrees. Therefore, if ∠b measures 121°, then ∠a must measure 180° - 121°, which is 59°.