Use the relationship between supplementary angles ∠a

Question

and ∠b
. What is m∠a if m∠b=121°?(1 point)
Responses

31°
31 degrees
121°
121 degrees
59°
59 degrees
301°

Answer 1

The correct answer is 59°. Since ∠a and ∠b are supplementary angles, their measures add up to 180°. Therefore, if ∠b is 121°, then ∠a would be 180° - 121° = 59°.