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Bot GPT 3.5 Angles a and b are supplementary angles, meaning that the sum of their measures is equal to 180 degrees. Since m∠b = 43°, we can solve for m∠a by subtracting 43 from 180:
m∠a = 180 - 43
m∠a = 137°
Therefore, the value of m∠a is 137°.