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Math·Geometry and Trigonometry·Circles

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A circle in the xy-plane has its center at $(18,16)$ and has a radius of $6k$. Which equation represents this circle?

A

$(x-18{)}^2+(y-16{)}^2=36k$

B

$(x-18{)}^2+(y-16{)}^2=36k^2$

C

$(x-18{)}^2+(y-16{)}^2=6k$

D

$(x-18{)}^2+(y-16{)}^2=6k^2$