Now write your conclusion in part D as a theorem, and prove the theorem using a two-column proof. When you write the proof, refer to the diagram you created in part A. As part of the proof, you will have to construct a line through point A parallel to
BC
Mark the point where the new line intersects the angle bisector, BD, and label the point E. Take a screenshot of the
construction, save it, and insert the image led the space below before you begin your written proof.
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X Х.
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