In the standard $(x,y)$ coordinate plane, a circle with its center at $(8,5)$ and a radius of $9$ coordinate units has which of the following equations?

Summary Submit Skip Question

The equation of a circle in standard form with center $(h,k)$ and radius $r$:

$$(x-h)^2+(y-k)^2 = r^2$$ $$(x-8)^2+(y-5)^2=9^2$$ $$= \boxed{ (x-8)^2+(y-5)^2=81}$$