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SAT Math Practice Question #21099 - SATify | SATify

#21099

coordinate geometry

circles

medium

90 sec

A circle in the $x y$ -plane has the equation $(x - 5)^{2} + (y + 7)^{2} = 81$ . Which of the following gives the center of the circle and its radius?

A.

Center: $(5, - 7)$ , Radius: $9$

B.

Center: $(- 5, 7)$ , Radius: $9$

C.

Center: $(5, - 7)$ , Radius: $81$

D.

Center: $(- 5, 7)$ , Radius: $81$