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For an equilateral triangle the centre i...

For an equilateral triangle the centre is the origin and the length of altitude is a. Then, the equation of the circumcircle is :

A

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

B

`3x^(2)+3y^(2)=2a^(2)`

C

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

D

`9x^(2)+9y^(2)=4a^(2)`

Text Solution

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The correct Answer is:
D
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