1. The problem asks to name the angle pairs formed by two parallel lines cut by a transversal and to type the 4-letter code in ALL CAPS with no spaces. 2. Important angle pair types when two parallel lines are cut by a transversal include: - Alternate Interior (A): angles on opposite sides of the transversal, inside the parallel lines. - Same-Side Interior (D): angles on the same side of the transversal, inside the parallel lines. - Alternate Exterior (G): angles on opposite sides of the transversal, outside the parallel lines. - Corresponding (H): angles in the same relative position at each intersection. - Vertical (C): angles opposite each other at the intersection. - Adjacent (F): angles next to each other sharing a side. - Complementary (I): angles summing to 90 degrees. - Same-Side Exterior (B): angles on the same side of the transversal, outside the parallel lines. - Obtuse angle pairs (E): pairs of obtuse angles. 3. From the description, the four angle pairs to name are likely: - Alternate Interior (A) - Alternate Exterior (G) - Corresponding (H) - Vertical (C) 4. The 4-letter code in ALL CAPS with no spaces is: AGHC