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 relationship between supplementary angles is that they add up to 180 degrees. Therefore, if m∠b=121°, then m∠a is 180° - 121° = 59°.