Given that mz3 is equal to 74°, we need to find the measure of m5.
To find the measure of m5, we can use the fact that when two lines are parallel, the corresponding angles are congruent. In this case, line 1 and line 6 are parallel.
Looking at the diagram you provided, we can see that mz3 (74°) and mz5 are corresponding angles. Therefore, the measure of m5 is also 74°.
Therefore, the measure of m5 is 74°.