What is a Face in Geometry? Definition and Examples

In geometry, a face , is any of the two-dimensional flat surfaces of a solid figure. For example, one face of a cube is shown in the figure below in red.

Face of a cube

A face can be any polygon such as a square, a triangle, a rectangle, and so forth. The cube above has a total of six faces and all these faces are squares.

Faces of a solid figure can have different shapes. For example, the pyramid below has 7 faces. However, one of them is a hexagon and the other faces are triangles.

Faces of a pyramid

Not all space figures have faces.  A sphere for example does not have any faces.

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