Everyday Math
# Angles and Lines

Throughout geometry, angles and the lines that form them have highly intertwined relationships. Whether measuring the bond between molecules or computing the parallax between stars, understanding how angles gives rise to different shapes and distances makes for a powerful geometrical tool.

In this chapter, you can expect to see and learn how to solve questions like this one:

If you want to jump right in, **concept quizzes** train you on a specific technique in angles, while the **challenge quizzes** are slightly harder and test your knowledge from a variety of the ideas learned in the concept quizzes.