What is a net in geometry?

• A. A flat layout of all faces that can be folded to form the solid.
• B. A 3D image of a shape.
• C. A tool to measure volume.
• D. A formula for calculating area.

Answer: (A)

A net is a flat layout of all the faces of a solid that can be folded along the edges to form the 3D shape. It shows exactly how the faces connect and lets you see how many faces, edges, and vertices the solid has. This is different from a 3D image, which is just a picture of the shape, and from a tool to measure volume or a formula for area, which are used for different tasks. Nets can be drawn in many different ways for the same solid, as long as all faces are included and connected along edges so the shape can be folded up.