SAT Math Practice Question #12532 - SATify | SATify

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SAT Math Practice Question #12532 - SATify | SATify

#12532

coordinate geometry

circles

geometry

hard

150 sec

In the xy-plane, the graph of $4 x^{2} - 8 x + 4 y^{2} + 16 y = 64$ is a circle. What is the radius of the circle?

A.

4

B.

$16$

C.

$20$

D.

$21$