The Medium Diagonal of Octagon is the length of medium diagonals or the line joining one vertex and any one of vertices that closest to the opposite vertex of first vertex of the Regular Octagon. And is denoted by dMedium. Medium Diagonal of Octagon is usually measured using the Meter for Length. Note that the value of Medium Diagonal of Octagon is always positive. Typically, the value of Medium Diagonal of Octagon is greater than 0.