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In triangleABC, if AD is the median and ...

In `triangleABC`, if AD is the median and `angleABC = 90^@`, then `AC^2` =

A

`AD^2 . BD^2`

B

`AD^2 + BD^2`

C

`AD^2 + 2BD^2`

D

`AD^2 + 3BD^2`.

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