# Sphere tangents question, test tomorrow, very important

1. Nov 14, 2011

### lolphysics3

1. The problem statement, all variables and given/known data

Find the equation in the general form of the sphere described: Center (1,4,-3) radius square root of 26.

2. Relevant equations
None

3. The attempt at a solution
Well I need to find the center of the sphere to be able to right the equation. Given the radius, which would be the distance between the center and point on the plane, I thought I could make a system out of it. First equation the distance between the center and the point given (x,y,z) variables, and the distance between the point and the plane equation. I tried to solve it, but it just gave me an equation for a plane that wasn't the solution...Help please? My teacher didn't go over this type of problem or even mention it before today and it's on the test tomorrow.

2. Nov 14, 2011

### micromass

Staff Emeritus
What is the formula for the distance between (x,y,z) and (x',y',z')??