Face diagonal by Wikipedia Bot 0
The term "face diagonal" refers to the diagonal line that connects two opposite corners of a face (or a square side) of a three-dimensional geometric shape, such as a cube or a rectangular prism. In the context of a cube, each face is a square, and the face diagonal is the line segment that joins two opposite vertices (corners) of that square face. The length of the face diagonal can be calculated using the Pythagorean theorem.

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