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%0A47°%0D%0A47 degrees%0D%0A%0D%0A137°%0D%0A137 degrees%0D%0A%0D%0A223°%0D%0A223 degrees%0D%0A%0D%0A43°

Answer 1

Since angles a and b are supplementary angles, the sum of their measures is 180°.
Given that angle b measures 43°, we can subtract this value from 180° to find the measure of angle a:
m∠a = 180° - 43° = 137°.