To Measure a Sphere
Click > 
Measure and select a sphere, or select a sphere and click > Measure. The Measure dialog box and a measurement panel open showing the sphere area, radius, diameter, and x-, y-, and z-values of the sphere center.
Measure and select a sphere, or select a sphere and click > Measure. The Measure dialog box and a measurement panel open showing the sphere area, radius, diameter, and x-, y-, and z-values of the sphere center.