Learning goals: Teacher Facing Comprehend the term “vertical angles” (in spoken and written language) refers to a pair of angles created by two intersecting lines. Generalize (orally and in writing) that the opposite angles created by two intersecting lines have equal angle measures. Use reasoning about angle measures to identify complementary or supplementary angles that are not adjacent. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 7.7 Angles, Triangles, and Prisms, Grade 7.