Lines a and b are parallel. What is the measure of ∠5 if ∠4 measures 104°?

Based on the definition of alternate interior angles, the measure of ∠5 = 104°.
Alternate interior angles are interior angles that lie opposite each other on the transversal and they are congruent to each other.
From the image given, angle % and angle 4 are alternate interior angles.
Therefore:
∠5 ≅ ∠4
m∠5 = m∠4 = 104°
Thus, based on the definition of alternate interior angles, the measure of ∠5 = 104°.
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