Question

What is the equation of a circle whose center is at the origin and whose radius is 16?

Answer 1

For a circle with center at (a,b) and a radius 'r', it's equation is:
\[(x-a)^2 + (y-b)^2 = r^2\]

What do you think now?

Answer 2

(x-a)^2+(y-b)^2=256??