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Math·Geometry and Trigonometry·Circles

easy

A circle in the $xy$-plane has its center at $(2,1)$ and has a radius of length $7$. Which equation represents this circle?

A

$(x+2{)}^2+(y+1{)}^2=7$

B

$(x-2{)}^2+(y-1{)}^2=7$

C

$(x+2{)}^2+(y+1{)}^2=49$

D

$(x-2{)}^2+(y-1{)}^2=49$