Learn what lines, line segments, and rays are and how to use them.

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

Extending thinking from points and lines (1 and 2 dimensions) to planes (3 dimensions).

Consider how precise definitions of geometry terms are like angle, circle, parallel lines, and a few others.

Explore a very famous and useful ratio.