Angles a and b are supplementary angles. What is the value of m∠a if m∠b=43° ?(1 point) Responses 223° 223 degrees 43° 43 degrees 47° 47 degrees 137°
Since angles a and b are supplementary, this means that the sum of their measures is 180 degrees. Therefore, if angle b has a measure of 43 degrees, angle a would have a measure of 180 - 43 = 137 degrees.
So, the value of m∠a is 137°.