Use the relationship between supplementary angles ∠a and ∠b . What is m∠a if m∠b=121° ?(1 point)

Question

Responses

301°
301 degrees

31°
31 degrees

121°
121 degrees

59°

Answer 1

Supplementary angles are two angles that add up to 180 degrees. Therefore, if ∠b measures 121 degrees, ∠a must measure 180 - 121 = 59 degrees. So, m∠a is 59°.