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Find the equation to the circle which pa...

Find the equation to the circle which passes through the points `(1,2)(2,2)` and whose radius is `1`.
show that there are two such circles `(x−1) ^ 2 +(y−2) ^ 2 =1 ` and `(x−2) ^ 2 +(y−1) ^ 2 =1 `

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B, D
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