The line segment connecting opposite polyhedron vertices (i.e., two polyhedron vertices which do not share a common face) in a parallelepiped or other similar solid. Also called a body diagonal (Guy 1994, p. 173).
Space Diagonal
See also
Euler Brick, Face Diagonal, Parallelepiped, Perfect Cuboid, Polyhedron Diagonal, Polyhedron EdgeExplore with Wolfram|Alpha
References
Guy, R. K. Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, p. 173, 1994.Referenced on Wolfram|Alpha
Space DiagonalCite this as:
Weisstein, Eric W. "Space Diagonal." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SpaceDiagonal.html