What is the name of the relationship between ∠1 and ∠5 ? adjacent angles

alternate exterior angles

alternate interior angles

corresponding angles
Two parallel lines cut by a transversal. Angles are labeled one through four, starting above the top parallel line labeled 1 and 2 going left to right. Below the top parallel line labeling 3 and 4 going left to right. Angle 1 is acute. Angles are also labeled 5 through 8, starting above the bottom parallel line being labeled 5 and 6 going left to right. Below the bottom parallel line the angles are labeled 7 and 8 going from left to right.