The altitude A D of a A B C , in which ...

The altitude `A D` of a ` A B C ,` in which `/_A` obtuse and, `A D=10c mdot` If `B D=10 c ma n dC D=10sqrt(3)c m ,` determine `/_Adot`

`60^(@)`

`30^(@)`

`105^(@)`

None of these

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