Question

In a circle whose equation is `(x - 1)^2 + (y + 3)^2 = 9`, what are the coordinates of the center and the length of its radius?

Answer 1

the center is (1, -3) and the radius is 3

Explanation:

in the form

`(x-x_0)^2+(y-y_0)^2=r^2`

you can see that the center is `(x_0,y_0)` and the radius is r

so the center is (1, -3) and the radius is 3