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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?$\newline$F. $(x-8)^{2}+(y-5)^{2}=81$$\newline$G. $(x-8)^{2}+(y-5)^{2}=9$$\newline$H. $(x+8)^{2}+(y+5)^{2}=81$$\newline$J. $(x+8)^{2}+(y+5)^{2}=9$$\newline$K. $(x+5)^{2}+(y+8)^{2}=81$