Posted by **Ray** on Tuesday, August 17, 2010 at 8:12pm.

Center and radius of x^2 + y^2 – 4y = 0.

- geometry -
**Henry**, Tuesday, August 17, 2010 at 9:39pm
STD Form of Circle:

(x - h)^2 + (y - k)^2 = r^2, C(h , k).

x^2 + y^2 - 4y = o,

Complete the square:

x^2 + y^2 - 4y + (-4 / 2)^2 = (-4/2)^2,

x^2 + y^2 - 4y + 4 = 4,

Convert the perfect sq to a binomial:

(x - 0 )^2 + (y - 2)^2 = 4 = r^2, r=2.

C(0 , 2).

## Answer this Question

## Related Questions

- geometry - . Which of the following circles would show the locus of points in a ...
- geometry - Write an equation for each circle if the coordiantes of the center ...
- college pre-calculus - 4x^2+4y^2-16x-24y+51=0 is the equation of a circle. where...
- math - 4x^2+4y^2-16x-24y+51=0 is the equation of a circle. where is the center ...
- math - 4x^2+4y^2-16x-24y+51=0 is the equation of a circle. where is the center ...
- Analytic Geometry - lengths? - Square ABCD has sides of length 4, and M is the ...
- geometry - suppose the diameter of a circle is 20in. long and a chord is 16in. ...
- Geometry 10th - A cone is inscribed in a sphere with a radius of 5 centimeters....
- geometry - Write an equation for each circle described. Center at origin,radius ...
- geometry - center C has a radius of 13.Chord AB=10.find the distance from the ...

More Related Questions