SAT Math Practice Question #37469 - SATify | SATify

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SAT Math Practice Question #37469 - SATify | SATify

#37469

coordinate geometry

circles

hard

120 sec

Calculator OK

In the $x y$ -plane, a circle is defined by the equation $3 x^{2} + 3 y^{2} - 18 x + 6 y = 30$ . What is the length of the circle's radius?

A.

$10$

B.

$25$

C.

5

D.

20