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In an equilateral triangle ABC, the side...

In an equilateral triangle ABC, the side BC is trisected at D. Then the correct relation is

A

`9AD^(2) = 7 AB^(2)`

B

`8AD^(2) = 9AB^(2)`

C

`7AD^(2) = 9AB^(2)`

D

None of these

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The correct Answer is:
A
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