Question

Wat is the equation of a sphere?

Answer 1

And how do you really use it, and when?

Answer 2

http://en.wikipedia.org/wiki/Sphere#Equations_in_R3

Answer 3

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

Answer 4

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

Answer 5

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

Answer 6

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

Answer 7

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

Answer 8

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

Answer 9

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