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In triangle ABC, AB = 6 cm, AC = 8 cm, ...

In `triangle ABC`, AB = 6 cm, AC = 8 cm, and BC = 9 cm. The length of median AD is:

A

`sqrt 119/2` cm

B

`sqrt 317/2` cm

C

`sqrt 115/2` cm

D

`sqrt 313/2` cm

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