Seven $1 \times 1 \times 1$ unit cubes are glued together to create the figure shown, including one cube in the middle of the figure that you can't see.

What is the surface area of the figure?

Three sets of eight identical cubes are placed into the three different figures shown. Which figure has the greatest surface area?

**Surface area** is the total area of all of a 3D figure's surfaces.

27 unit cubes are packed together to create this $3\times 3\times 3$ cube. Each face of a unit cube has an area of 1.

If all 8 of the corner cubes are removed, by how much will the surface area of the figure increase in the structure that remains?

How many of the following nets can fold up into the square pyramid shown above?