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A B C\ a n d\ D B C are both isosceles ...

`A B C\ a n d\ D B C` are both isosceles triangles on a common base `B C` such that `A\ a n d\ D` lie on the same side of `B Cdot` Are triangles `A D B` and `A D C` congruent? Which condition do you use? If `/_B A C=40^0\ a n d\ /_B D C\ =100^0;\ ` then find`\ /_A D B`

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