Circle as intersection of sphere & plane (Co-ordinate Geometry)

Circle as the  intersection of a sphere & a plane 

(1.)Sphere through a Given Circle

(2.)Circle as the intersection of two sphere

(3.)Equation on of a sphere passing through the intersection of two sphere

(4)Diameter form of the equation of the a  sphere

Figure-To find the equation of the sphere the extremities of whose diameter being  coordinates which shown in the figure 

Diameter form of the equation of a sphere

FIgure-Diameter form of the equation of the a  sphere

Circle as  intersection of  sphere &  plane

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Question-Circle as the  intersection of a sphere & a plane