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Anonymous
x2 + y2 = r2, where r is the radius.
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x2 + y2 = 2
It is x2 + y2 = 4
x2 + y2 = 49
(x-0)² + (y-0)² = r²
x2 + y2 =x2 + y2 = 5x2 + y2 = 10x2 + y2 = 25