Write the standard equation of a circle with center (2, 1) and radius 8. The standard equation of the circle is ...

In the Cartesian plane, the general standard equation for a circle with center (p, q) and radius r is

(x-p) ² + (y-q) ² = r²

Here we have (p, q) = (2,1) and r=8 so our equation is

(x-2) ² + (y-1) ² = 8²

I guess we evaluate the 8².

Answer: (x-2) ² + (y-1) ² = 64