Knowing your lines and angles is crucial for mastering SAT and is one of the foundational steps of geometry. Before you can tackle some of the more complex multi-shape problems that often appear towards the end of the test, you'll need to know just how to solve for all your missing angle measures.
Almost without fail, there will be exactly two problems on any given SAT on lines and angles (note: these problems are distinct from questions on lines and slopes). Though this is a small percentage of the test in and of itself, line and angle knowledge provides the backbone for other geometry problems and so should be ranked high on your studying priorities.
This will be your complete guide to lines and angles on the SAT—what they are, how you'll see them on the test, and how to solve these types of questions to maximize your points on test day.