Write 4-6 sentences describing how many acute and obtuse angles are created when 2, 3, or 4 parallel lines are crossed by a single transversal that is not perpendicular to them. Identify how many unique acute angle measures there are and how many unique obtuse angle measures there are, explaining your reasoning. Propose a generalization for when there are n parallel lines, and confirm the generalization matches what was found for the cases of 2, 3, or 4 parallel lines. Prove the generalization, explaining all of your reasoning.