The Inradius of Octagon is the radius of incircle of the Regular Octagon or the circle that contained by the Octagon with all edges touch the circle. And is denoted by ri. Inradius of Octagon is usually measured using the Meter for Length. Note that the value of Inradius of Octagon is always positive. Typically, the value of Inradius of Octagon is greater than 0.