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ABC is an equilateral triangle with side 12cm and AD is the median. Find the length of GD if G is the centroid of `triangle ABC`.
ABC एक समबाहु त्रिभुज है जिसके भुजा 12cm और AD मध्यिका है। GD की लंबाई ज्ञात करें यदि G,`triangle ABC` का केन्द्रक है।

A

`6 sqrt3`

B

`4 sqrt3`

C

`2 sqrt3`

D

`3 sqrt3`

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