Circle through the vertices of an equilateral triangle centred at the origin (median = 3r/2)

1. A.
   $2\sqrt{5}$ units
2. B.
   $3\sqrt{5}$ units
3. C.
   $4\sqrt{5}$ units
4. D.
   $6\sqrt{5}$ units

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1. A.
   $x^2 + y^2 = 9a^2$
2. B.
   $x^2 + y^2 = 16a^2$
3. C.
   $x^2 + y^2 = 4a^2$
4. D.
   $x^2 + y^2 = a^2$

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