1.

Find the equation of the circle with centre : (1, 1) and radius `sqrt(2)`

Answer» Centre `-=` (1,1) and radius = `sqrt(2)` units.
`:.` Equation of circle,
`(x-h)^(2)+(y-k)^(2)=r^(2)`
`rArr" "(x-1)^(2)+(y-1)^(2)=(sqrt(2))^(2)`
`rArr" " x^(2)-2x+1+y^(2)-2y+1=2`
`rArr" "x^(2)+y^(2)-ax-2y=0`


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