Let's label the given angles and identify which one can be helpful in finding the measure of ∠ 1.
Angles ∠ 1 and ∠ 6 form a linear pair, so their measures add to 180^(∘).
m∠ 1+m∠ 6=180^(∘)
It is given that m∠ 6=125^(∘). We can substitute this in the equation above to find the measure of ∠ 1.
