The sum of supplementary angles is 180 degrees. Since angle b is given as 43 degrees, we can find the measure of angle a by subtracting 43 degrees from 180 degrees:
m∠a = 180° - 43° = 137°
So, the value of m∠a is 137 degrees.
Angles a and b are supplementary angles. What is the value of m∠a if m∠b=43°?(1 point)%0D%0AResponses%0D%0A%0D%0A137°%0D%0A137 degrees%0D%0A%0D%0A47°%0D%0A47 degrees%0D%0A%0D%0A223°%0D%0A223 degrees%0D%0A%0D%0A43°
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