# Thread: Find Equation of Sphere

1. ## Find Equation of Sphere

Find equation of a sphere with radius r and center P_0.

NOTE: P_0 is read "P sub zero."

r = 1; P_0 = (3, 1, 1)

2. Originally Posted by magentarita
Find equation of a sphere with radius r and center P_0.

NOTE: P_0 is read "P sub zero."

r = 1; P_0 = (3, 1, 1)
You are supposed to know the general equation of a sphere with the center C and the radius r:

$(x-x_C)^2+(y-y_C)^2+(z-z_C)^2=r^2$

All values are known - so where is the problem?

3. ## ok..........

Originally Posted by earboth
You are supposed to know the general equation of a sphere with the center C and the radius r:

$(x-x_C)^2+(y-y_C)^2+(z-z_C)^2=r^2$

All values are known - so where is the problem?
Are you saying to plug and chug with what's been given?

4. Originally Posted by magentarita
Are you saying to plug and chug with what's been given?
Correct - nothing more.

And that's the reason why I can't believe that you have had difficulties with this problem.

5. ## I.....

Originally Posted by earboth
Correct - nothing more.

And that's the reason why I can't believe that you have had difficulties with this problem.
I simply rushed through it. You are right. The question is easy.