How many of these could be an unfolded version of the pyramid shown above?

*(The cube must be closed with no overlapping faces.)*

So far, we've treated geometric solids in an abstract way, but now let's consider what happens when we add some real measurements.

How long is the orange path between the blue point and the red point on the surface of this $3 \times 3 \times 3\text{ m}$ cube?

By unfolding the cube from the last question, we can see how to solve for the length of the path.

From this view, we can also see that this path is *not* the shortest path between the two points.

Nets are a powerful tool for visualizing and understanding 3D shapes.

In this course, we'll show you how to use nets to solve all kinds of different problems.