Choose the correct alternative.The equat...

Choose the correct alternative.The equation of a circle with origin as centre and passing through the vertices of an equilateral triangle whose medium 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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