Definition
Cube
A cube is a three-dimensional solid with six congruent square faces.
What it means
A cube is built from six matching square faces. At every corner, three faces meet. Turning it changes which faces you can see, but it still has the same six faces, twelve edges, and eight vertices.
Remember it
Six matching squares fold into one cube.
Example
Make a net from six 3 cm by 3 cm squares. Fold along the shared edges. The squares become the cube’s six faces, and every cube edge is 3 cm long.
Watch for
A rectangular prism with any non-square face is not a cube, even when it looks box-shaped.
Common mix-up
This page means the geometric solid, not cubing a number such as 4³.
Exact meaning
A cube is a three-dimensional polyhedron with six congruent square faces. It has 12 equal edges and 8 vertices, with three edges meeting at each vertex.