# math

posted by .

What is the equation of a circle with its center at (0,3) and a diameter of 6.
a. x^2+(y+3)^2=9
b. x^2-(y-3)^2=9
c. x^2+y^2-6y=0
d. x^2+(y_3)^2=0
e. x^2+(y-3)^2=36

• math -

If we know that the equation of a circle with the centre at (x0,y0) and radius r:
(x-x0)² + (y-y0)² = r²
Which choice would you take?

• math -

I think it's b.

• math -

b. is correct!

## Similar Questions

1. ### math

Write an equation of a circle with the center (-5,-4) and radius 6. The general equation for a circle is (x-a)^2 + (y-b)^2 = r^2, where r is the radius of the circle and (a,b) are the (x,y) coordinates of the center. Make the appropriate …
2. ### algebra

1)Write an equation for the parabola with focus (1,3)and vertex(0,3) answer= x= 1/4(y-3)^2 2)Write an equation for a circle if the endpoints of a diameter are at (1,1)and(1,-9) answer= (x-1)^2+(y+4)^2=25 3)Which is the equation of …
3. ### math

-a circle with center at the point O(0,0) also has the point P(-2,3) on it. The equation of this circle is?
4. ### Algebra II

In this set of eight problems, we have to match each equation with the correct description of its graph. However, these are test corrections I'm doing and I do not have the previous multiple choice answers so I can deduct from it, …
5. ### Math

The points (4, –5) and (– 4, 1) are endpoints of a diameter of a circle. (a) Find the center of the circle. (b) Find the length of the radius of the circle. (Note that this is a distance.) Give the exact answer. Show work. (c) …
6. ### math

What is the equation of a circle with its center at (0,3) and a diameter of 6?