A straight rod of length 9 unit, sli...

A straight rod of length 9 unit, slides with its ends A, B always on the x and y axes repectively. Then the locus of the centroid of ` Delta OAB ` is

` x^ 2 + y^ 2 = 3 `

` x ^ 2 + y^ 2 = 9 `

` x ^ 2 + y^ 2 = 1 `

` x ^ 2 + y^ 2 = 81 `

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