I need help figuring out an equation. The equation of a circle with the center of the circle at the origin (0,0) on the Cartesian grid is: x^2+y^2=r^2.

But what is the equation of the center of the circle is not at the origin?

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- Oct 15th 2009, 01:20 PMsunnyyueliangEquation of Circle
I need help figuring out an equation. The equation of a circle with the center of the circle at the origin (0,0) on the Cartesian grid is: x^2+y^2=r^2.

But what is the equation of the center of the circle is not at the origin? - Oct 15th 2009, 01:23 PMe^(i*pi)
- Oct 15th 2009, 05:29 PMpacman
with center @ (h,k), it is (x - h)^2 + (y - k)^2 = (r)^2

examples:

i) (x - 2)^2 + (y - 3)^2 = 25

ii) (x + 2)^2 + (y + 3)^2 = 9

see graphs