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A circle having centre at rthe origin pa...

A circle having centre at rthe origin passes through the three vartices of an equilateral triangle the length of its median being 9 units. Then the equation of that circle is

A

`x^2+y^2=18`

B

`x^2+y^2=81`

C

`x^2+y^2=36`

D

`x^2+y^2=9`

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