3D Coordinate Geometry

Equation of a sphere


If the two spheres \((x-4)^2+(y-1)^2+z^2=27\) and \((x-13)^2+(y-10)^2+(z+9)^2=a\) are externally tangent to each other, what is the value of \(a?\)

Consider a sphere that is tangent to the \(xy\)-, \(yz\)-, and \(xz\)-planes. If the sphere passes through \((6,3,-3),\) what is the product of all distinct possible values of the sphere's radius.

The center of the sphere \[x^2-10x+y^2+z^2-18z+99=0\] is \((a,b,c).\) Find the value of \(a+b+c.\)

The equation of a sphere centered at \((4,-6,-5)\) with radius \(2\) is \[x^2+y^2+z^2+ax+by+cz+d=0.\] Find the value of \(a+b+c+d.\)

What is the radius of the sphere \[x^2+y^2+z^2=22?\]


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