# Find Equation of Sphere

• Oct 12th 2008, 06:11 AM
magentarita
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)
• Oct 12th 2008, 11:03 AM
earboth
Quote:

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:

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

All values are known - so where is the problem?
• Oct 12th 2008, 09:25 PM
magentarita
ok..........
Quote:

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

\$\displaystyle (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?
• Oct 12th 2008, 09:39 PM
earboth
Quote:

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.
• Oct 13th 2008, 06:31 AM
magentarita
I.....
Quote:

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.