Final answer:
Line p and line q are parallel, so the measure of <1 can be determined using the property of corresponding angles.
Step-by-step explanation:
Corresponding angles are formed when a transversal line intersects two parallel lines. In this case, line p is the transversal line and line q is parallel to it. Since line p and line q are parallel, the measure of <1 will be the same as the measure of its corresponding angle on line q. So, we can determine the measure of <1 by using the given diagram.