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Math·Geometry and Trigonometry·Circles

easy

$(x+5{)}^2+(y+8{)}^2=15^2$

In the $xy$-plane, the graph of the given equation is a circle. What is the length of a radius of this circle?

A

$\sqrt{15}$

B

$\frac{15}{2}$

C

$15$

D

$15^2$