Question

How do you write an equation for a circle with center (-11, 3) and radius r = 9?

Answer 1

`(x+11)^2+(y-3)^2=81`

Explanation:

To do this, we'll us the standard equation of a circle: `(x-h)^2+(y-k)^2=r^2`, where `h,k` are the coordinates of the centre, and `r` is the radius of the circle. Applying this, we get:
`(x+11)^2+(y-3)^2=81`