The locus of the midpoint of a chord of ...

The locus of the midpoint of a chord of the circle `x^2+y^2=4` which subtends a right angle at the origins is (a) `x+y=2` (b) `x^2+y^2=1` `x^2+y^2=2` (d) `x+y=1`

`x^(2) +y^(2) =1`

`x^(2) +y^(2) =2`

`x+y=1`

`x+y=2`

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