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The equation of a circle with origin as ...

The equation of a circle with origin as centre and passing through the vertices of an equilateral triangle whose median is of length 3a is

A

`x^(2) + y^(2) = 9a^(2)`

B

`x^(2) + y^(2) + 16a^(2)`

C

`x^(2) + y^(2) =4a^(2)`

D

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

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