First one
Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/let-there-be-a-triangle-abc-let-the-bisectors-of-angle-b-an/triangles/1057714
Regards
https://www.meritnation.com/ask-answer/question/let-there-be-a-triangle-abc-let-the-bisectors-of-angle-b-an/triangles/1057714
Regards