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In an equilateral triangle ABC, AO, BO and CO are the angle bisectors meet at the incentre 'O'.D, E and F are the mid- points of AO, BO and CO respectively. A circle with centre 'O' passes through D, E and F. Area of the circle is `3pi cm^(2)`. What is the perimeter of triangles `(Delta) ABC`?

A

`12sqrt3cm`

B

18 cm

C

`6sqrt3 cm`

D

none of these

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The correct Answer is:
B
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