The figure above shows how to create a sphere by specifying a previously defined point and a radius.
A bounding plane has been specified.
$$
$$ Declarations
$$
ENTITY/PT1,PT2,PL1,SPHR1
$$
$$ Geometry Definition
$$
PT1 =POINT/0,0
PT2 =POINT/1,0
PL1 =PLANE/YZPLAN,0
$$
$$ Sphere Definition
$$
SPHR1=SPHERE/CENTER,PT1,RADIUS,1,PL1,PT2
A Sphere with a Bounding Plane