# Lines

Contents

Lines, line segments, and rays are fundamental to geometry. Our mission: learn what they are and how to use them.

## Lines, line segments and rays

Let's draw points, lines, line segments, and rays. We'll also think about perpendicular and parallel lines and identify these in two-dimensional figures.
Common Core Standard: 4.G.A.1

## Measuring segments

Using a number line, let's learn how we measure segments.