The Radius of Hypersphere is the distance from the center to any point on the Hypersphere which is the 4D extension of sphere in 3D and circle in 2D. And is denoted by r. Radius of Hypersphere is usually measured using the Meter for Length. Note that the value of Radius of Hypersphere is always positive. Typically, the value of Radius of Hypersphere is greater than 0.