You can create a solid surface by parameters or by center point.
To create a sphere:
Click Sphere(Solid toolbar) or click Geometry, Solid, Sphere.
In the dialog , select the type of you want to create the sphere:
Parameters. Create a sphere by parameters. The parameters contains:
Center Point . Select a point as the center of the sphere. Select another point as the point on the surface or define the radius directly.
a.by coordinate system b. by center point