Top Radius of Truncated Cone is the distance between the center and any point on the circumference of the top circular surface of the Truncated Cone. And is denoted by rTop. Top Radius of Truncated Cone is usually measured using the Meter for Length. Note that the value of Top Radius of Truncated Cone is always positive. Typically, the value of Top Radius of Truncated Cone is greater than 0.