Question

How do you classify `x^2 + y^2 = 16`?

Answer 1

It is a circle with centre (0,0) and radius equal to 4

Explanation:

`x^2+y^2=16`
is in the form `(x-h)^2+(y-k)^2= r^2`
where your radius is r and your centre is (h,k)
ie `(x-0)^2+(y-o)^2= 4^2`