The center of a circle is at (0,0), and the radius of the circle is 3-2. Which equation represents the circe?

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Answer:
B. x² +y² = 18
Step-by-step explanation:
The standard form equation of a circle with center (h, k) and radius r is ...
(x -h)² +(y -k)² = r²
For (h, k) = (0, 0) and r = 3√2, the equation is ...
(x -0)² +(y -0)² = (3√2)² = 3²·2
x² +y² = 18