(0,0) is the centre of the circle passin...

`(0,0)` is the centre of the circle passing through the vertices of an equilateral triangle. If the length of the median of the triangle is `9` units then equation of the 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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The correct Answer is:

C

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