Find the centre and radius of each of...

Find the centre and radius of each of the following circles :
(i) ` (x - 3)^(2) + (y- 1) ^(2) = 9`
(ii) ` (x - (1)/(2) ) ^(2) + ( y + (1)/(3) ) ^(2) = (1)/(16)`
(iii) ` (x + 5) ^(2) + ( y- 3 ) ^(2) = 20`
(iv)` x ^(2) + (y- 1 ) ^(2) = 2 `

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