$\"\"$

The center of the sphere is $\"\"$ .

Consider the any point on the sphere is $\"\"$ .

The distance between center and any point on the sphere is radius $\"\"$ .

If $\"\"$ and $\"\"$ are two points in space, the distance from $\"\"$ is

$\"\"$ .

Here $\"\"$ and $\"\"$ .

$\"\"$

$\"\"$ .

The equation of the circle is $\"\"$ .

$\"\"$

The equation of the circle is $\"\"$ .