Use the relationship between supplementary angles ∠a%0D%0A∠%0D%0A%0D%0A and ∠b%0D%0A∠%0D%0A%0D%0A. What is m∠a if m∠b=121°?(1 point)%0D%0AResponses%0D%0A%0D%0A121°%0D%0A121 degrees%0D%0A%0D%0A59°%0D%0A59 degrees%0D%0A%0D%0A301°%0D%0A301 degrees%0D%0A%0D%0A31°

Answer 1

If ∠a and ∠b are supplementary angles, it means that the sum of their measures is 180°. Therefore, if m∠b = 121°, then m∠a = 180° - 121° = 59°. So the correct answer is 59°.