SAT Math Practice Question #12598 - SATify | SATify

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SAT Math Practice Question #12598 - SATify | SATify

#12598

coordinate geometry

circles

geometry

hard

40 sec

What is the diameter of the circle in the $x y$ -plane with equation $x^{2} + y^{2} = 81$ ?

A.

9

B.

18

C.

81

D.

162