Question

What is the equation for a circle with a radius 4 centered at the point (-1,-1)

Answer 1

(x+1)^2 +(y+1)^2 =16

Explanation:

We can write the equation of a circle as

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

where (h,k) is the center and r is the radius

(x--1)^2 +(y--1)^2 = 4^2

(x+1)^2 +(y+1)^2 =16