The measure of m ∠A0B is 20. Option C
m ∠BOC = 27
m ∠AOC = 47
m∠A0B = unknown
But note that the sum of m ∠BOC + m ∠A0B = m ∠AOC
We have,
27 + m ∠A0B = 47
m ∠A0B = 47 - 27
m ∠A0B = 20
Therefore, the measure of m ∠A0B is 20. Option C
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