The equation of a circle with origin as ...

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

A

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

B

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

C

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

D

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

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The correct Answer is:

C

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