OpenStudy (anonymous):

Wat is the equation of a sphere?

6 years ago
OpenStudy (anonymous):

And how do you really use it, and when?

6 years ago
OpenStudy (jim_thompson5910):

It's very similar to (x-h)^2+(y-k)^2=r^2, but it now includes a third variable z and a constant j. So the equation of a sphere centered at (h,k,j) is (x-h)^2+(y-k)^2+(z-j)^2=r^2

6 years ago
OpenStudy (anonymous):

Wat would be the z??? I know wat the x and y coordinates r, but wat is the z( and j)???

6 years ago
OpenStudy (anonymous):

given a point in space ypu can fill that point into the equation to test if it is on the surface of the sphere.

6 years ago
OpenStudy (jim_thompson5910):

z is just another variable and j is a constant (usually given and fixed)

6 years ago
OpenStudy (anonymous):

if you have an x and a y axis drwn on a page then the z axis would come out of the paper

6 years ago
OpenStudy (anonymous):

Does the equation of a sphere give you sort of a volume thing, or does it give you surface area?

6 years ago
OpenStudy (anonymous):

no those are different things, the equation of a sphere would be used to test if a point in space is on the surface of the sphere

6 years ago