Adjacent angles share a common side and a common vertex without overlapping, like ∠1 and ∠2. A linear pair consists of two adjacent angles whose non-common sides form a straight line, like ∠1 and ∠3. Vertical angles are opposite each other when two lines cross, such as ∠1 and ∠4.Let me know if you need more help! If this helps, feel free to mark it Brainliest